Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8e93a3f86404e8…

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 23:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5ad5bbdc314cd176e1bd31d234b2654 SHA-1: b9764be06d6fe63ba1f747174c882f374ae712e3 SHA-256: 8a8e93a3f86404e878083e214c6a9517b01f4285eef2b2e1a6139781ff57ebfe
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary attack pattern involves luring users to these sites, which may host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://orgue-chantepie.info/FCKeditor/upload/file/64399464008.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92bac06b0---bibab.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0765d879f9---25466941438.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nfrqskul79sn3ltota9jcli8qd/polunurokigogikusidorunon.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95f4447c5---dogemapajufodejipuvub.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///202105298440_195534847.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j47120e0c1uc94k5ikdte46l93/87948985222.pdf
    • https://eyetracking.pl/userfiles/file/14223327856.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/1493525018.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/83c321f5de2cadd86d55e19f26486e4a/tubugeguziximesovizugater.pdf
    • https://foulardfotografando.it/file/kozijuzimeme.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160898f3652a06---71841004389.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607befb62d103---kovatit.pdf
    • https://camgloberealtor.com/userfiles/file/zomezoniwuwudoj.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f590cd1f5---wurufogubavikubib.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2208a3c6b8---vukawuwoxazugokemizu.pdf
    • https://ludifrance.fr/userfiles/file/58996038076.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608183906b0a5---malegivozinuliwis.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c79be9b1489c05143a6202a7b9d4b479/kivosijivexisefatoxo.pdf
    • http://msamericapageant.com/clients/873634/File/36481581750.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f333086019651950daa7f766a2e8b195/nitulaw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0d0212eb---rituwutarasu.pdf
    • https://banderlogclub.ru/Files/file/dagirom.pdf
    • https://giriconsultancy.com/content_files/files/jenuzemujonakorozeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=thriving+at+college+alex+chediak+pdf
    • 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_off0000f429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 16792 bytes
font_01_sfnt_off00010c40.bin
b601e6121dc3f4f304c2d1ec6c1223ac0f759e261c04df7bc223388e2ad1c929
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 10956 bytes
font_02_sfnt_off0001256c.bin
26e059d418dac67c45e0960ec9460ba5b75e39b7b05f418ffc75aaeda3e10b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 17608 bytes