Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bb36c197a47a03…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 23:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8570bccd935209b745536d9722418875 SHA-1: e325525dbbb7bb377536aabc571627a30f6fb5c1 SHA-256: 73bb36c197a47a0304e9dc8797808c0b425107b6e4d72e05a33462887615eb1b
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to phishing or malware distribution sites. The 'MFA / one-time-code harvesting lure' heuristic indicates the document's content is likely designed to trick users into providing sensitive information or approving fraudulent authentication requests.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://smidgel.ru/uplcv?utm_term=pioneer+pre-intermediate+student%27s+book+pdf PDF link annotation
    • http://zovsh.com/Uploadfiles/files/lonugomanipefuwidak.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a7861d9718b---30115763027.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/fogesexuziv.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/kozobukusugi.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/noripisa.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/fekogapazuvaregefe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/34eb889e1e327fb87db09829e57de13a/gesitekuromeputidulosiguf.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe3cdff1a---tosibabaseliwozidoji.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13166163822.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/98152595845.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/31443081143.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/db8e206c88f98c2c48f086ca9107b711/4038744224.pdfIn PDF document text
    • http://rilta.net/userfiles/files/zenete.pdfIn PDF document text
    • http://santeh.md/img/files/4731394440.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a36b7882---rusinuvaku.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rifesomazenoxixorosowupe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0iq7svo15ep58ojf1ihdp6r8e5/39990837845.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s6i4r6tcprat3ut06vr7oidiqo/56705737949.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/2683081915.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/42345182046.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061610508_170319262.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/wikim.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_off0000c2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 18224 bytes
SHA-256: 32c37b9630abad6b32d3b6e8e5b2b56c6312313a121a846ac5f31e5a1fa16301
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 11016 bytes
SHA-256: 731050a8183f6e902178e0a53391a66feb1a2e2aa016577b70f327fd27a139b6
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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