Malicious PDF — malware analysis report

Static analysis result for SHA-256 953cdb35b97451fb…

MALICIOUS

PDF

134.2 KB Created: 2021-08-15 13:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d09c67b8b245369113eca1e94840db17 SHA-1: a2eab617c21a28697b53714f9389ffc295ce2c96 SHA-256: 953cdb35b97451fb83e62e53bc402a51814f618a634d92ed47717dd44db5c176
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160df4a74c9197---gofosukigibipobeledura.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2177385a4fd76e4a1a75ba01531b6381/40685221741.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f46b41d19---26712076424.pdf
    • http://ekolojikweb.net/upld/userfiles/file/62934575878.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/natetorajixulil.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c585e7fd5a60a3f704b573310e23b69b/97706586359.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa24b11e4c4---gotoguzukimujofikopuvat.pdf
    • http://rafaelstore.ru/upload/files/75757119394.pdf
    • https://eko-briketes.lv/userfiles/files/85663640164.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607415d07cb97---4284232414.pdf
    • http://yomamasushitogo.com/uploads/files/xenabosomoralasorugameda.pdf
    • http://architetturaurbanistica.it/userfiles/files/makazirozivajodilanuv.pdf
    • https://holocaustresearch.pl/nowy/photo/file/vidukewumure.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5d8d49f471fcedcaaeef5b99ae1f148f/nafubavemiliz.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7adab8af6---34307804718.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/jtnu69ki822b6ev8vfq2auo263/41375295237.pdf
    • https://jphotographyllc.com/userfiles/file/31890347040.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2da34e7510---sejinabuzejonalogukidupaf.pdf
    • http://jaatkinson.com/userimages/pubowuwesakedadulifigevaz.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/96004972855.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d836f5350f---632668391.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5702fdb6756d723359068bb326ee21b6/21929883601.pdf
    • https://inncredel.com/uploads/21085898174.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/53d19f175e6b3a2c117d69411397c897/tojijodexeroluwebixu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+the+6+weaknesses+of+the+articles+of+confederation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A885 16792 bytes
font_01_sfnt_off0001c097.bin
5e14552415a044cf38b016e811ca95356746a425759e012c6089cd6a8a1a4d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C097 18232 bytes
font_02_sfnt_off0001f087.bin
2eff0ec349a0d38ac4f9e8a65e4b8aa19a28c20335e3aee88cad8d5b1939def1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F087 10912 bytes