Malicious PDF — malware analysis report

Static analysis result for SHA-256 405383bb775a86d1…

MALICIOUS

PDF

82.7 KB Created: 2021-08-31 02:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b7584a9b8b140f50cb071cf01b226db SHA-1: 367136d68377a5ead07cea32f43042624f25fe1b SHA-256: 405383bb775a86d19ae70a9cde4d758ee38ed2f5308e9af28530ae0f1bb5da97
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.001 Malicious Link T1071.001 Web Protocols

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains multiple links, many hosted on compromised CMS upload directories, designed to lure users into clicking a link that impersonates Microsoft. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates the primary goal is credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=end+of+contract+notification+letter+sample.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074489580c56---xaxozatapudeforugawefuva.pdf In PDF document text
    • http://mondoacquapiscine.com/userfiles/files/691919915.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/44658333237.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5cf9d3acee976268cb98feda20724b1f/42224104442.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g576dkf9odbbaim63rd3o98kqf/xilezobe.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2df94cf9e51ae79f8adb9c24ddd3a923/mupitiruragamefuruz.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5560355d02eea8fc8420f6804c8db6d6/wopozu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/wigitijibomanaruvesode.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/putitubomumu.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/14775458126.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f5d3bb7c---73344306346.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/salamenadogetukenik.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99f0b02f9d---lumikezovisotis.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/91019769499.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4a89addf---45006485165.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/68745153855.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9d2d0208---96013440530.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021053122425190.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/dotorozazu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26a39bd144---lujosevupegi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/8153640405.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nilafotakulewoz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffedf2a37---77421800227.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4044718db8c05d877b01dc1dc5264b44/10488003241.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/dezigarajebib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=end+of+contract+notification+letter+samplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 17376 bytes
SHA-256: 4923e059d403bf04b0c5fbade6a30a55ecdbe80cb00ccb480b5882c729c044e9
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 10764 bytes
SHA-256: 5686be73ea4f1f56de2ced8e5c407335d7811a1f397b097131dedfdaa5e69979

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