Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd51c830d79fa749…

MALICIOUS

PDF

176.4 KB Created: 2021-06-17 11:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d00bcb5f7e419aff551b8c8f1b5803d8 SHA-1: 6a56f73850abfa269f7a39ee8b3e6362c2b25be6 SHA-256: bd51c830d79fa7497e528fb65e05bfeab80920aec3bc998dee83199dc7938704
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document's structure and embedded URLs indicate an attempt to lure victims into downloading further malware, likely disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/uplcv?utm_term=advanced+mechanics+of+solids+ls+srinath+solution+manual+pdf PDF link annotation
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace66b94735---bakixetubeleluxatubumu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/35860516896.pdfIn PDF document text
    • http://beliangka.com/contents//files/mamesojevalewebededal.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f36d9ab6c---dolemisawom.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lfgs96ifd0efqvlnc1sidbohc0/73665876110.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4ce6ad03---46172530057.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081b45e66edc---27235075669.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1c0c4d566cee79d40f89505783e7c3b2/11812194716.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e4852aa1c7ab5cde71bc274d7e7d2df2/lutadanaletalewiragovop.pdfIn PDF document text
    • https://digireg.se/upload/xizowosisinejer.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/65309747058.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86bb6e110---22892043263.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f25f4ed24---bixukesadezowi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xotavegitug.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160858adf19f29---powifodidekoj.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0ffbcc3342512c9f3e7e154b67532e6c/katemibu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd5605738---89634314598.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/lulikasutasowotaz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f1e5ab6d---tagafevidenarozapadukog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000255ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255CE 5444 bytes
SHA-256: 7df5387e2dc4b7e22f4bd9d7e79d21961182d0ebf174846690f4b7a3899650b2
font_01_sfnt_off0002682e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2682E 15564 bytes
SHA-256: 757f16c6f53cc92ed56a5647b263249db7288fe4b99c706d9b712e8ad8418e17
font_02_sfnt_off00029c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C19 16708 bytes
SHA-256: c967fa70f3259d3484799a805fa42a0d9e34e54053d133493e87a06afa16f5c4

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