Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5e09c5753dca73…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 04:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08fff6e395cd451698dbec9ecf77ac06 SHA-1: 284344fc8614962ffef7d0d0f4fb42cec66734df SHA-256: 6b5e09c5753dca73f05d37c1b90e3855862bea8747d6c4a7a8ca58a4cccf14f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/64b9c440bbfde0b279bff4a9379d4845/47363494434.pdf
    • https://northcoteplaza.com/userfiles/file/xubufulowixikas.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd783e3c3d---kipaga.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5f564eec---vunowewopalafuzitesilavi.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0679a5f0f8a391b0509a865269e2230d/kumapurikavuzezut.pdf
    • http://poorclarescork.ie/images/somifexefunavuvasis.pdf
    • http://rld-carbon.ru/file/rojoku.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/67d4af6c8cdb2d0a1718739df525b2ad/74754760595.pdf
    • http://buren-kompanie.de/userfiles/files/tufadexabalilekazo.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/nn7mm37g1psbi3f6dl3smsf0ih/85025670364.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/29311762761b1dcf46ba05105e72a933/30227620815.pdf
    • http://sushi-belovo.ru/files/75300713186.pdf
    • http://dok-vo.ru/userfiles/file/resutagusatunatekikifa.pdf
    • https://goodline.by/userfiles/file/26005448821.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/m1ukpu98gha1339lk9adf18s02/59402796711.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mhuh4t2822ueg15p47386sc1qa/jalusuvonafudexul.pdf
    • http://akicgiyim.com/userfiles/file/futagobowag.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4917372a81722e17f4290994fe99310b/kigiwepepopikiwe.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06fcb87218c549b16bd9c50e3b2b6e0d/33798644983.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a5153bf1---20091476658.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4bnpr9500vgm8553ldmju8gadr/fuworilupukafepugirato.pdf
    • http://campfirewtx.org/userfiles/file/tiguvisegemur.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873942d81ba---33921608993.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=common+causes+of+syncope+in+older+patients+emt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16792 bytes
font_01_sfnt_off0001033b.bin
9c974fb83f1fe89dea274e909229a0f2a05809537e7298d16096635b6d9db5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 11024 bytes
font_02_sfnt_off00011ce5.bin
4e2292d1a890d1490e1a5da68151f08f009e0191791e82376e12165439388880
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16788 bytes