Malicious PDF — malware analysis report

Static analysis result for SHA-256 884bf9f994407576…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 23:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f9d26bcc7a992e112e31e6ff61aefaf SHA-1: 8d9b92b5d47667e439690d0bc50ddbe788befc08 SHA-256: 884bf9f99440757641a18515adac47c4f966b87c290ece0609538652bd8f3f73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself appears to be a link farm, likely intended to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=gre+vocabulary+flashcards+pdf PDF link annotation
    • http://cnpair.com/userfiles/file/tifotedumuw.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/finimut.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/gikukobamoxolopi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5fe9g3d8pdnh7ipdn1sfaujdmu/lumadabav.pdfIn PDF document text
    • http://africareview.in/userfiles/file/vuzevowunulib.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/532dffd029a5a0a099619458ac1a2713/vimawikozalug.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5179ef7f52b61d9b75042bed51068a82/vuzunerorunolul.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/38239426515.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/49121917421.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/fedevonupobijadate.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e8f637258cbc42e00ba56efd62a7ec1/72482970445.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301410029845.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/505a325186b02552e20db53d71cc5d97/toxaduwobabelenivezubu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1a1186b6---warisimuxejir.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d60862f6df---80239332737.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/30023724664.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/cc3b665479f11d71f153b9c921cd14b1/toxotowawutasokotejo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596783fa97---27296844831.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/17375058323.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57001435432.pdfIn PDF document text
    • http://pb-book.com/user_file/file/pabiniwukevejiwoxetumelo.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rezawajuzifodoxoragixu.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/sidekitazilujigoju.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/31b06da2289e3d7540d334a7b76e269c/pidesemivoxabukozid.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 10884 bytes
SHA-256: ac3e2d83fae36b9bc9947e991a5642c9aac9ed0cbd93d147a60ec283c9419d65
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 19984 bytes
SHA-256: 3cc0d4efd9fad397367f2b30f5bb943c10de5de95a1eef1241dae9533cffae07

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