Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a4328f83cd2c63…

MALICIOUS

PDF

98.5 KB Created: 2021-09-14 06:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b8d1ea0309b4087e0569dfee889fb9e5 SHA-1: 0e5a078453f00d894462dca1145ad03cc6d20793 SHA-256: 56a4328f83cd2c633b39c948d21fa43a1ca642d94541651ce17560c500f6c84d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://hhsmelt.com/upload/files/noxobaferugewugimuriko.pdf In PDF document text
    • http://ozcetinler.com/userfiles/file/rufevividageroruni.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/63757813474.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/41871716031.pdfIn PDF document text
    • https://noventa.cz/media/files/file/46421622323.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/dodukevexezem.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/ranewufajekomisulugomelol.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/46622239581.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/dasalarozatejuripolaji.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/15211372909.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa6839424d---wawuwiturimufiduluj.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/fajagujobonunenewititu.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xegivezuditu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2u46gt0pfuj79rqsvqsukvvhc0/fijujenemow.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zugusaxutim.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9a065b5d---86569103794.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/43866404136.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwuwuv.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/fizunofiba.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/16885530411.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/dokipozo.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/jipikesosavododog.pdfIn PDF document text
    • http://allier-genealogie.org/File:/totiruko.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/mojotuwilupogizeriferase.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zaludatipalozamesojiv.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32063178124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adb+setup+toolPDF 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_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 10148 bytes
SHA-256: 2ab8d6c65b264a3f938fc2a2303bf569a495e9b608efb48489d0885089be832d
font_01_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 19808 bytes
SHA-256: 7d2aec91911ffe00f5184168ecef59296662b38ab0bb6250d8ef40554d367f5e
font_02_sfnt_off00016433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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