Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0146f3057924b52…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 18:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf0f0de36e85ac05308989a2319336b5 SHA-1: 9a17c5be18a41adebd2c7afeb470f7aea032ac65 SHA-256: b0146f3057924b527b4aff58c38a360a03673c52b050a127c6250e75024cd93d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised websites, indicating an attempt to redirect users to malicious content. The presence of multiple unknown URLs suggests a broad campaign to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nbnjl.com/userfiles/files/kotebugazi.pdf In PDF document text
    • http://cloverpark1959.com/clients/51168/File/linaxiwi.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/35272798102.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/64262556737.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/979082187fe2fdffd365d91d3dc8da86/tiwota.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/40517548685.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/42029760887.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3a5572e63976e23aebc62dcee0375ec2/ruwofopuroriket.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/xobozunomufabujuruxep.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b682c1956e---99213929071.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609eabe9e05e4---tidugelalesavanubop.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1p7vodjl6ea370a4714p866g59/51230462279.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ceb51b8bb983214e710760177c1c9a99/durulupavodiki.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/bidamevi.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/jinikavonuv.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630780010.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b31357bbc---72971888815.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/i1mt8gj5vlojc431bddjdenpu4/311458548.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/80e6335e22b2baf47e874351a4a1bde6/juropepunezuruvuwa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b8d5a893b---70032311805.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d21299b5---zojizefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=protocols+of+osi+model+layers+pdfPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16244 bytes
SHA-256: 19dcd3fef212ffde5245bde81d52e5df91846c51ca4445ce80340f20fb772b91
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10792 bytes
SHA-256: 995e4be42c2aebd2c6f507796c341d39515bcbb3736d4ecdc1ca561bce643e2f
font_02_sfnt_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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