Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b3ea5062ca39da…

MALICIOUS

PDF

77.0 KB Created: 2021-06-27 23:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1098e2fc2c62bd2709c126237ba9a356 SHA-1: 7e45fb3661712f67f08bfcd8c74fed6ee8bb81e5 SHA-256: 74b3ea5062ca39da91214d1b1596c72a8b56a89636ce2a551b367e4a00bd5305
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, directing users to potentially malicious content. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h1jbjp9dk3ec2j74haer1rugmc/8942128473.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5f9a65a8---ruxosu.pdf
    • https://ost-fogging.com/upload/files/lalujepukizu.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/kudujusinozuwoged.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22416d8c1---32206091894.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea95d3c200---60393529277.pdf
    • http://asupuro.com/user_data/image//file/fawukelamakol.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089420e67262---75498389772.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0df339e2fa32b094ae3fe504896efd2a/pisamibidewubu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607681b9c24e5---soxudedekuriziwizupumetof.pdf
    • http://summithigh75.com/clients/867147/File/11889271406.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606da46cdcfc8---wikunujexave.pdf
    • https://diedacorporation.net/freesiafiles/file/pebemazanu.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2fa3e464---lexotinigaj.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8ie7csm30ar0jt4r1hcleq2cr1/wilix.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a064b08d3f7---78791047358.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/93baa1ea50112d9efabbdd9ed2bf7371/64930522233.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/rasalotonajufu.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46150b2554---furutitikojozuladodaxe.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160806789033bb---wekotolasunumurogotifipul.pdf
    • http://say-international.eu/userfiles/file/46410003822.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/t05vqqpjrlkeh60eh6l5i2vded/nenopukegaverubejugiru.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb92d1b390---desefumexamowarulibubi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=easy+rice+pilaf
    • 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_off0000ce8f.bin
600f10007b410fcc2d10937e6de233d5e35f9bed2a80c118ec834c3be0561f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 16104 bytes
font_01_sfnt_off0000f82e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
font_02_sfnt_off00011045.bin
0ef38d262450f4facb26266f1bde3bd58fc8a684ccdbb46dbac2db12046b31b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 10248 bytes