Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4c85b214a291c5…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 08:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24dbd15d4548bf4979d707bbc674fa9a SHA-1: a9ab210bfe10bc317b420f19238dde41c00418c9 SHA-256: ec4c85b214a291c5204fafaf9fe87b6ace68fe1e3f76cee497d09ce5a0785d72
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful external sites, likely for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/b853eaia7vg25desu31qhf8u34/38102530678.pdf In PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/39816770721.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/tikem.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sovekebifofapewagexaf.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/7abaaba6b82dde75ac3b73a6b69d79cb/59991036831.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/76006608696.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/gufepipebi.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/59949027852.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/86234000521.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ako2v699mhte8mtfgp6sstjt1s/bokozajilof.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/94k95f2eqe17hhbp30sem5hjo3/93014439174.pdfIn PDF document text
    • http://jucal.es/images/file/femadojasovofejamaku.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df44955368---20639901522.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075b2f0b2ece---famuguxuj.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/68305138548.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/fitogeferozukozubek.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210618111227.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb42478f8b8---53904918697.pdfIn PDF document text
    • http://foodchemsino.com/d/files/lewikoxutomesasi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081277142da5---duzadaj.pdfIn PDF document text
    • http://hnspkjx.com/d/files/13041232554.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/galexosumati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jehovah%27s+witnesses+history+pdfPDF 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://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_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 17316 bytes
SHA-256: 3e5d27fdb1d49de49623efa991a10bff6a79786e93764e38f675b66fea354828
font_01_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001434c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434C 10840 bytes
SHA-256: 73b90d18b9acf0906efbc5a98f57b3e13f47b02761ba5a00dd216c919b99dd20