Malicious PDF — malware analysis report

Static analysis result for SHA-256 73102d20b03bd2b2…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 09:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4a7467e84e64296b38bb43d88a3bdca SHA-1: 3d44246250264f18bd24b35c14bf012d5202a144 SHA-256: 73102d20b03bd2b219f980eb25a49e4aac7ae77018c53b367847f477497fafcc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable or potentially compromised infrastructure. The primary attack pattern involves luring users to these external sites, which are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v2gifetnjn14jn7e8lh79ilcu0/93969453883.pdf In PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/46826235703.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vokamivomeja.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a7661f3d40a40ec67b58ff1e8da91815/63449670937.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/famuka.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210516215023.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a993b8c8430---22619066148.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3f00bc004---toleneped.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5d58beb363a1cff3b15772f14c0c793e/fifolanuta.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/54555369382.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f425976417---85802148971.pdfIn PDF document text
    • https://aedwea.com/upload/foto/55783755612.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b97ddeeac---54247726977.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088c49b5f7fb---73706026224.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070154b75e28---31630478209.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6765f17a---25059426558.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d3050b3fc165d6e292373c351a55a555/33743423161.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/jokagutodewaza.pdfIn PDF document text
    • http://clarasonic.com/upload/file/jizulebole.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/mafasezi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/16d742300e18f9b89485f9fa72da769c/85058571545.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b2s6lht7a2reenkne2c6bg361t/bikomatipefeletozamifovo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-1/20210701052617222108.pdfIn PDF document text
    • http://waypl.pl/upload/File/95022606833.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/htjktp6gfokcjo05t2phecnl6h/27923367472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pigeon+river+campground+michiganPDF 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_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 10816 bytes
SHA-256: 185388675fba767734ff5ca1609c320d34358df52ff6e0bf4d82b5fcd9064e2c
font_01_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 17056 bytes
SHA-256: c682ee10d27d4293eb1f79ab17879c8ba8b4287c560346eb36670a38290e866a