Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f40bc97f370e11d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 09:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be86b2b7c51dbfef499153ef7291d322 SHA-1: ef75ee38638b6266cf3871e3037c90a56031c8d8 SHA-256: 6f40bc97f370e11d52705fee8c751b09255df7d1f8c8983cb86822ec87d7fb78
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 sites, suggesting it is designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082db939e70e---20818448768.pdf In PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/laliro.pdfIn PDF document text
    • https://verner.lt/images/files/zibubed.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb5c6d524---furodujesu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a6928b778bafd1c6063c3442350cb7d9/46213831010.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ni2nmndm84h0tlj706tj7ue8q1/pagabe.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fototorebusuvos.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/40334562307.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088276a119db---liwukefodafupuvojeve.pdfIn PDF document text
    • http://salt17.com/userfiles/files/28451203812.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c590a10fd---45308951749.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64358b94fa---baxiwewixerabulow.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737b4d30575---49691674239.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/10460438016.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5346ee000---82588144575.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/40147491772.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/89959386220.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tmfflg8ancmneq389sbn7qoihl/zedikaw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b9e7248f---61632431935.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/66607693580.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/37984935220.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/6025645487.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/92008358504.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63a392c8---duwivek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=find+dining+near+mePDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 10136 bytes
SHA-256: 4f6924ce4f5dddccee1527f9f51a25d70f30e368239ac84a8f570f2f44fd0467
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 18096 bytes
SHA-256: c42c7284461cc15b46ad9b87d710ec28cefdbb3a33d748a02c285a024c463ab9
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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