Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3904aa7435df62…

MALICIOUS

PDF

85.4 KB Created: 2021-08-15 17:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57b010bbbc6b68848a14ab1d98d99dd8 SHA-1: 69407803f36b652bbe9dc25a10acbf34a5ff9ca8 SHA-256: 3c3904aa7435df62612eb136adccb92f5ac94de9a4ffe51cbf79c3f2d960f5fb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external, untrusted sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5849300db---20415455901.pdf In PDF document text
    • http://asfalon.com/__files/file/labofosekajix.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a487ebb7---9062001818.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/bakumo.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/37560223779.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/liwajokowoluxepipijibe.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/90c59b4b2b95e0e22a61174e20332405/72665775276.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/18165133647.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/gulujujerukiver.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/30e852673f4c64e20c5d574d22e7e6bb/41362793824.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161068b2119533---nomafejepomobomumebiweges.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/70318965879.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/vudaloludikazekeseta.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tokapodapemuwedize.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/87723837688.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/27704913390.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/rulufasagazafaje.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1919f6bf---10455832531.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/21314994287.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/72835495449.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/25254268740.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/30cf6a589fe189d66ab10947e9a21dd7/15669969012.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/dunakuzuzobe.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/91152341523.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/85949934319.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/dumiwobezofipuwuzalipa.pdfIn PDF document text
    • https://goodline.by/userfiles/file/3388161963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tiempos+recios+vargas+llosa+pdf+descargar+gratisPDF 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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 10888 bytes
SHA-256: 8fdbd74ef93a33615b30b904f77f8cf711b99a6994132cb88a4914180a44d28c
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 18444 bytes
SHA-256: 4830a755df1025760f02c862682a8f272d455b6d4bdaf2a2fc757bb9d723b03b
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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