Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef106e9d8ccdc94…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 22:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7b1e9ad59f3ace0464cb86f99eb30669 SHA-1: 66a05decdc781cfd326b2edf09e2cb86c6e8c930 SHA-256: 8ef106e9d8ccdc94a7b37ef40f27b4ba2d162db83daa926efd39b4a7c5112eb1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Antivirus Software Disabled

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure and a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=iobit+malware+fighter+8.1+pro+serial+key PDF link annotation
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/83225147008.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/44495318647.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xudawebemeso.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/48919450205.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/vojubuzifafalav.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/40544155396.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8acc989411---36215378070.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5739cccfc---27563587381.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/77908975009.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/50704582117.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/76553273076.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vgkr2e0c9aj3denojdac89disa/10688043390.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/nedukotaferugilogokusin.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/ximosifu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/3610767514.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/94461599837.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/84578530698.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/bazoxewekibom.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/88727579375.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q3olfiidj4o5mq70d3clsg07h7/91166844898.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cc0d0e4d1c186383f9af81d04ebc8cdf/lusagumeremudok.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jagiwanukelanubiwebu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608107a5d1d51---71498992789.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/36462660805.pdfIn PDF document text
    • 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://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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 17504 bytes
SHA-256: cf6d50ab93be3a52676f15a7c0518a46253baffee148f708ed94dc77b7abb28d
font_02_sfnt_off00014b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B30 11408 bytes
SHA-256: 61db9f7a3a4eb31078de9eca1ff0632a2f17470dba60bd4c7a4ef811c6675ae8

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