Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4401beb3ae4b47e…

MALICIOUS

PDF

89.3 KB Created: 2021-07-22 01:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e9fd789b1b9da07badd5dbd3db8d406d SHA-1: 0c9b80f16822a1b7f898f1624fe207f8f714627c SHA-256: b4401beb3ae4b47e832a93d91705568da98b4be39d1752c13cad79bcbb80bae3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/28316661387.pdf In PDF document text
    • https://robert-zauer.cz/userfiles/file/tavuluxomekofibigaxajet.pdfIn PDF document text
    • http://agama-rc.com/upload/files/72882276883.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/45805246364.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/035289968c3ba1f95d8bb9b57fec3ac9/tuluvagareranenij.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/27c4dd33ddeb10d9a59c4b5018a6a75a/lakimapezoxon.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/50197795945.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/143c509d69384df38b53ea11d947f837/laluvajesevubixuk.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7176f1828---xolijuxoga.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bba851a353665494359534321ae2658a/75281360741.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/97b85f95bdeb73deb01a3348081dcd0b/75256076397.pdfIn PDF document text
    • http://benrassam.com/uploads/files/11131199632.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608252ff7f9ab---54568112327.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec25837445---75959637645.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6214ced2c9205cefa5e0b9f7b49ba6ee/52440075058.pdfIn PDF document text
    • http://teraval.cz/res/file/40942715047.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/35b5403d1a6a04b7719888eeee9bddb5/zozunenamiwitupot.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086778fdbb69---xufanijagojete.pdfIn PDF document text
    • https://x-software.cz/data/file/potixilagula.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/53149483788.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/17395883835.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/63b9quue2v978jbjbrfd9kg4m6/zebovijuxesojijedez.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3625db53---4666454552.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/rakalelasaruwevutiz.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/2371986812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=am+and+fm+are+examples+of+modulationPDF 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_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10844 bytes
SHA-256: a2e8e7a24938f80a3f4266944e72d2f72159ab5ef1af7b34857de1786543c2b9
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 17812 bytes
SHA-256: 9558d3fe6818e3f4ab5a8daae375689e93c6974a4a8b364154ee718a4e3b1b47