Malicious PDF — malware analysis report

Static analysis result for SHA-256 79249bde863a0c4c…

MALICIOUS

PDF

105.4 KB Created: 2021-09-01 19:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d948020bc4ada698b7a6e19e2b5423de SHA-1: 10c967202b9ed19f13781defb67ab4da6cb7d238 SHA-256: 79249bde863a0c4cb5305947cb7a33bebd0f63c8848416812b1cb453fddd3046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/zopexemi.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf7ac70007---72011733724.pdfIn PDF document text
    • http://tavio.su/files/file/82549150687.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/judomaru.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/78572735342.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/53896545499.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/binuzunem.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610adffe69e2b---56394627186.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27bb1a894---66714683277.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a87cb964c---48951225804.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/21259970593.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vonejelasavejinul.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec6e773ec---62336270488.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1b60d314---kajanewu.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/92514112600.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gisewogofizilamekobobej.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66f8ab562---77174737354.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/vilanilebom.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/pafasadebewejolawotu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zazemavu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/88467001267.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/kebubavinowejomaj.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/51368448516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=medicaid+capitation+rates+by+statePDF 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_off0001387f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 18128 bytes
SHA-256: aa0b6f922997f51850cf5f49b75e21bfd9a870160843877f9cafaddac4069792
font_01_sfnt_off0001678d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA4 10708 bytes
SHA-256: fc16dd6e2cdaa406c19b1bdc6417ad13d9fb76099fad11ff26573346b50fb623

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