Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f201b75bbc74c5…

MALICIOUS

PDF

80.3 KB Created: 2021-05-01 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a8abac1a28244a95b617c6e2b66b679f SHA-1: 3aad176a22f5cfa9c0b78b0b316b5038e4b0b246 SHA-256: 88f201b75bbc74c5b01a16c99b01ca5bbc3427b4955314e58e2c6ef0b548d8ad
196 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to multiple compromised websites hosting what appears to be a password-protected archive lure. The presence of ClamAV detection and ML flagging strongly indicates malicious intent, likely to trick users into downloading a malicious payload disguised as an archive. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a988018d4567ba7ce3869c4285ae042b/98616859137.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40c94f416---69109826320.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9038657a9c08e1c449a2e9c2f8ea53ab/tosexobuxuvokukaxaga.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/90b9dd4abd87dc52fd214f7f9a8afdc6/34650195832.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1d1bb8793fbe5221ba19ed15a6dc61b4/dopitejuxigaroler.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9cc0be5faf654963524539b793048f26/nijikixewuxefubilonobem.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/44cb0051b54cf021830cc47c652cc9da/datoxijifinimif.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085000d4bee9---84759792645.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/641502a9d5a546d0f3b2103d174bf44c/48316279928.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f2c751fa2c92cb903b5662a2c55348d0/60470751907.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8d8fa0539a06cc3dbae02163ec5dee42/refeniduxizijelam.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7ondns3i6l18mmrk49jjjg9vhg/xulatorivimonija.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/57085ec0fedf5aa096da3e34ddd6e355/98117971539.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sei3v69rm9f6805e73nrlk5mc8/xawajamuladasogovagejeloz.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/594beeaa2618d351033774c2913b336c/neguxubisuden.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ci7gut82l338dpuhskmnbperch/26030138267.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774c9c04f10---41883811748.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2cd2b6b1091f12eaf132724ecbdf3667/dapafuretekujib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=video+online+free+from+any+sitePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 4908 bytes
SHA-256: 997264dac6427a95e7eed40c59257a456694f00c1c76a028c743e56fac652b5f
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 11324 bytes
SHA-256: b0fbc4f8041704326ab1d25044b934c0c7be3d47a61a64922f08dd62c3f91e27
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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