Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c2c1e257309431…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 11:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb000a3846ed250e82466077b9185cba SHA-1: df322aae2c8967f2e4976f3d3158517afa1a7069 SHA-256: c4c2c1e257309431e963e016c7fecac0a1a4137b9ab28d1bb3e667bbe02e9d20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aliglobshop.com/userfiles/file/didesobejabun.pdf
    • https://alnahamgroup.com/userfiles/file/31980857428.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e2t8mtkdu2qaom95d8usc1j5ha/49751217164.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/93744545913.pdf
    • http://romangruszecki.com/uploaded/file/sizupalovofewapezisaja.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074823851bc2---99941669001.pdf
    • http://abwingsva.com/uploads/files/27654377943.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1ffa75fa---52577421637.pdf
    • http://aliceinformaticasrl.com/user/pages/32978960744.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/kitunubufatejotinowob.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/rowinanonitikuwi.pdf
    • http://www.hydro-tg.pro/upload/file/zosememobev.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3e6dbd59---78805025500.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607846885a994---ganeretisef.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3a75e6296895a71fb2731089ed01842e/vovirube.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0235451b029a6d1e608921e5039c5abe/doxedopavatop.pdf
    • http://mikailang.net/userfiles/file/20210508170813_1136038656.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a5e650529fcbd2a52b23154a1282a50a/84827271479.pdf
    • http://tele-video.ru/upload/files/suluz.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8c75d2e13756bfbd27c28ce5f25e76e8/51700666353.pdf
    • http://alltechsro.cz/files/newofobozokuzebujo.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088582c6eff6---zafogoromemomidazofa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=andretti+indoor+karting+prices
    • 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_off0000fb45.bin
6fae07fd7ce1a0a3dab373706d9b93c76748f3f36aeea4d4235fff96fec9bdd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10716 bytes
font_01_sfnt_off000113d2.bin
7966e4f5810b7b9f72ac37219cad932af6f28653c3fe8658986ea9689e291e34
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 17616 bytes
font_02_sfnt_off0001422e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1422E 16792 bytes