Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c46c382e08d3c97…

MALICIOUS

PDF

160.2 KB Created: 2021-06-28 09:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e2cd8253ce09e96ae28e1a0b171c34c1 SHA-1: 7842d2b5e95c9792f70e7b9c3b58e958c12b1265 SHA-256: 6c46c382e08d3c973abcb6ab77417202b453ff712ceb6dd95afa8a1f80123b72
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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
  • 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://dichvumayphoto.vn/webroot/img/files/12466872301.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821d0caf4---31559064510.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/07b57fccae6877b1eee54e84a9eb0276/pavax.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c578b606039c3f00140698d42a612b3f/46453395228.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d40bb42c4c006014cd5c8062bcd399c/jebulikur.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/26560805802.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae688db88---39113755354.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jilixotavewufa.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7976e39c9---40506614507.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/99888223781.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/86611638973.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ab6a498a7a61ba9380133330e5d8044d/betufasilatarotaburuguse.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/be82127e7ecde5882736ac0f13ba3513/supokulapi.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/97165851429.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bd6b3ba234303815f0edea8c716e0b11/bipofe.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/zivexanakutixade.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/71785ed77bd2a24ad27d7ba538d41b29/7651512141.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608567edd198e---46558212174.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebe627162---47727672385.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/63138732037.pdfIn PDF document text
    • https://ovalpolycoats.com/media/42029870604.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bivotakozuxujereb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kannada+proverbs+with+explanationPDF 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_off0002139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2139B 17868 bytes
SHA-256: 3cae20418b55bba42960b2601abf2cb2add8217a18978b40be1f67566d6a32f3
font_01_sfnt_off00024220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24220 10872 bytes
SHA-256: a9f845db11c6773e31c1ba9599f607e9c6dce8f30b54fc0bcee07377d72a6fda
font_02_sfnt_off00025b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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