Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7c503663c64c50…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 14:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ec9c0fafab89ddb444d161cf4707c1bc SHA-1: 480e3f92f8dc2ec70691dd3e2db4b0018d5d1974 SHA-256: 5b7c503663c64c50ff0f4b93913d23c47537d6f9cfcf70c9df050d17ea95097c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for SEO manipulation or phishing. The 'SE_CALLBACK_LURE' heuristic specifically flags the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crysiq.ru/uplcv?utm_term=mx10+pro+6k+latest+firmware PDF link annotation
    • https://faktxeber.com/resimler/files/37600348133.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6625957e5409ff743e4a51c8a9b6c77c/68471574152.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/84425783640.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/57884815383.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/99954968785.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/zalikozisasiwe.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/60043165088.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xuropize.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/rujozipizadifijuba.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/fibirajax.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/22876894705.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19440081598.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efed77e700---52242422526.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/76269359986.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021981387727.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/sewupadepunizuwu.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/62500053761.pdfIn PDF document text
    • http://nature-revive.org/files/file/xofuxatufeporivezo.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/pogijarasogigesoji.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139983107e73---savinibesililol.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/55039788115.pdfIn PDF document text
    • http://topflexsports.com/uploads/64651227062.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wasaf.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/28979785843.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c13656f3366754e7515425599968893f/xonikitezepekufozid.pdfIn 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://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_off0000b67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 16456 bytes
SHA-256: 5d3e85e0dd5756a005964155990d6df7b7ea1a7bbb409b5f1e7ee8516423777f
font_01_sfnt_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 11032 bytes
SHA-256: a91c41b659f7bb43d31904fd03e83029d2838d0a179322c13f2ee62719d96cd3
font_02_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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