Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc2885f0ffa5851…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 09:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 150d4bf9f677a44d467607fab3889025 SHA-1: c65db7b9f8baa6ecbcdbca9234cc84546b045445 SHA-256: fbc2885f0ffa58511b3087cff05a4cc177faeb0be067bb0dbf51f080ea507b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=danmachi+sword+oratoria+light+novel+volume+9+pdf PDF link annotation
    • https://hogozaty.com/ckfinder/userfiles/files/55826869972.pdfIn PDF document text
    • https://gangnampools.com/contents//files/patusawusit.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/powemabenikib.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/mepadoforazel.pdfIn PDF document text
    • http://darec.sk/files/files/60534259304.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rawexorelagomumuneke.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608878abcc5a7---99889345798.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ae511a97241---zegorijidozam.pdfIn PDF document text
    • https://ghnservizi.com/file/31141827872.pdfIn PDF document text
    • https://digireg.org/upload/gepivasovawoxi.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/5384874978.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/5570681605.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zabujov.pdfIn PDF document text
    • http://hasyo.net/files/file/pumotifovimo.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2ijsqnotan0jp27qdq87qnjms5/79343156517.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/23490943421.pdfIn PDF document text
    • http://clarasonic.com/upload/file/93678743531.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6a3800900---60368373058.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/90344078136.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af57650a8bd---xisamoxezebimotigin.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4f564fcf---41082375042.pdfIn PDF document text
    • https://unitjaya.com/contents//files/85680729232.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/mitetuwabe.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://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_off0000b431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB431 18860 bytes
SHA-256: aa4c54c5a0fbe0d174f0e661ff5c4deede7ddaded892b5d0c4dda2a3b388d5b1
font_01_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 11488 bytes
SHA-256: d01d69d0915b6876d36d4412184a336c817ec24cc7452d5f40df69e8b54cad4f
font_02_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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