Malicious PDF — malware analysis report

Static analysis result for SHA-256 88259e3b198b80ad…

MALICIOUS

PDF

128.0 KB Created: 2021-07-07 22:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 310cb8a539ee15bdaae4a3ff7ca047b8 SHA-1: e3ee16979f706c542d6d95100f72a66948587d98 SHA-256: 88259e3b198b80ad419dbf8b8a808e9e9d5b92d8da01cffb38997a2db20dada4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a link farm on compromised CMS uploads and a high ML classifier score. The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a phishing or spamming campaign. No scripts were extracted, but the presence of a link farm indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9592

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://kondicionery-dolgoprudny.ru/upload_picture/file/worolenawobixafiv.pdf In PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/abed7a764da261e8bc92aa256a79fa8f/57524239139.pdfIn PDF document text
    • https://windsbs.biz/files/file/lesobami.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/93620518811.pdfIn PDF document text
    • https://123natura.com/stockages/files/giwokugilutewilimipopoxun.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1f53814---vunig.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1faa562833---mirupejuluwa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855eeac68b2---82146950213.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd9f7d5c9---95598634172.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/bf7b34c967e510e3476ba847b723fedc/luxejan.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/momotajadefofapuxo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8f5b661---zurorabav.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44a07d28f---8992153382.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/3142118656.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/61487221477.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/rewubokigidaweritiginu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65824761071.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/56796483692.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886faaa2760---26688814971.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/vijitagagawi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0kor852vokqlo0j8k5qmd52in3/zawobure.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/54225955455.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/94638123158.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b08c116f---11867885589.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e610f5a5---82689692181.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9fc91b3e---992831977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+management+accounting+horngren+16th+editionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17785 17664 bytes
SHA-256: 70e0e105aea4d983e701a56b06021c626033c2f18d3000ed400550d7de04a7d5
font_01_sfnt_off0001a5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F7 10876 bytes
SHA-256: 864ee7bb85f84d3f0046c1ce965175ee4b487f0bc893c488b8ea2e07942c28ee
font_02_sfnt_off0001bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEBC 16784 bytes
SHA-256: c99aef456494be5d133b0b8b86d27761040c9fd3a050bb9b7638fbb69072c638
font_03_sfnt_off0001d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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