Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eef85031c8c0bd…

MALICIOUS

PDF

66.5 KB Created: 2021-06-14 06:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7f6c2c995126b4012de586fcd4c93ae9 SHA-1: 42d3f653d825d9e1359aab52eb133774784c218e SHA-256: 28eef85031c8c0bda521bd77edf1e8f0e24c574658cab9f731855a2c336804d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.8459

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=upper+limb+bd+chaurasia PDF link annotation
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/2156413106.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tetovamelifuxi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0b1a94384d8236f1402a62aa6309fcfb/43786469090.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/bibewipanoj.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3ca32e9480473150c8421c7bf777be73/tinobakuwej.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18ce94e6---68513423393.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xuxok.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5be0985482---daferejinijetudemizilo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983b7a1b4d6---zusetawi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8b256249---rovekabotavakofuxinili.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/ropipegupeveripatose.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/s08k6fqpt9t27jm26mi335lg7l/defigelotudobinekiwelo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a738e10e6ca---72357787411.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fea6231ac48a078cf925bf5731024398/87000529058.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dgg8ldfdq2ad11a5pogttghmeu/60504939876.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c15f9151b1b0024ca62c3f7ac77b81c5/74846516032.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c2b438ef---90320611256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/86ff4b0f82f56bf693d03380356bc38a/vevotorukites.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 5444 bytes
SHA-256: 0a570585621d69a3d36237b5e784bf189772e56a5bfc5fa149741307e1005d50
font_01_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 10208 bytes
SHA-256: bd78a43cfbd5ee7000bc28e8c9fd49710faab8e6f0366edbf710917ecac96ec4

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