Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a2b8ad21f57484…

MALICIOUS

PDF

62.6 KB Created: 2021-05-20 15:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c7aa872e4ecc33319ae48407068d239 SHA-1: 83cb6622d82942871fbe58530055c5a8677db75a SHA-256: d8a2b8ad21f57484dfc6d708c4174fa6c06dba9e9b130abf58951578c7e0f1a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=puedo+comer+higado+de+cerdo+en+el+embarazo
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/04c82937497c1bd30fa0a9b642a27a10/zaxujafotezorita.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096462f818ca---nozulepotoletitozosu.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e5sj9pupv7peteablsd2prchhj/79575591473.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/07b74597cb6e2af8a9b29bda1c5be23d/sudox.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717caf1ff6a---daxokinugix.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607236a16c561---39153892565.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607025542a7a9---sixodojavenaluv.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc9ed86e0---88846780330.pdf
    • http://lycee-elm.org/userfiles/file/61893954392.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde05c5295---84040452886.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47621dafd---novasalipujaxizosu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/96c5ffad5e8f5103bfb0606cdecdadf1/wevivudofom.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235574fde1---nedelezadowasekalowulemer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5de.bin
d4560395684cc1da4ab04b791ace024bc202101de2b7e374725f5fbe198bac9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5368 bytes

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