Malicious PDF — malware analysis report

Static analysis result for SHA-256 80baf479c40f07d6…

MALICIOUS

PDF

125.6 KB Created: 2021-09-05 11:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23a658cfea35546144e2a9954fd9e9c1 SHA-1: db394167651c246f30c85513e149c5f85745eb70 SHA-256: 80baf479c40f07d626e0f487890aac3814559f1814b9d41d8fd068b6ccac17a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=ley+de+violencia+intrafamiliar+colombia+pdf PDF link annotation
    • https://brianhigbielaw.com/UserFiles/file/fozovudopotikamugodejazul.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/duxamifukatimugonize.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/08c5df97118071ba101dc41731135a40/resoxumopi.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/bataxozokifedewobaj.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/25199922499.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/8876696529.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/nedate.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609621c4110a7---54397831161.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/85129526441.pdfIn PDF document text
    • https://kawanmto.org/contents//files/jekibunek.pdfIn PDF document text
    • http://web68s.com/upload/files/turibuvudokolafok.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7f856fd5---7103420707.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/togilasofezamegodazero.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimimamexujapegajasid.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/39556755414.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fenaken.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e716aded---26222423699.pdfIn PDF document text
    • https://ratoempat.com/contents/files/jatupefud.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/zitasutetapim.pdfIn PDF document text
    • http://clingac.com/d/files/26129878623.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/6716480329.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1e1e3f23---vatawenutomamite.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210804/16280223405548.pdfIn PDF document text
    • 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_off00017e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19641 10888 bytes
SHA-256: 33c4af100a445183a62c8bb11065cd2dd32edeb3452876fff40bc524c33b7580
font_02_sfnt_off0001af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF30 22720 bytes
SHA-256: 9b0eb95f4036853fdd9fba2b07a959873cb3354ec7f833b694bcf119d2098ca3