Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07a0f802214e880…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 01:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba8f712c74a9ae574c7403b15aa493c0 SHA-1: dc5bcda8c46b6b2561887ef32bff5eff862afc9f SHA-256: d07a0f802214e880770e57f26534c42a892f2e6125e863f0a08761fe99a922ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161347c4c65340---20927963659.pdf In PDF document text
    • http://autoklej.pl/app/webroot/media/files/zelomolujewezoz.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/nebixazenuti.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314c6b1f927---61359520289.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/64240697929.pdfIn PDF document text
    • http://gnox.vn/upload/files/duduxubomulozofated.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161303eee05205---rogijafilopevasowa.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/jakevetekez.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/28713599429.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/11384688103.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/xaguwabojujila.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/63251705566.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/34d864f74cdcad9478e865bda8beb004/23065981989.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/jupijazaxesasarimas.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9a7d290---gakugalivovokosotugax.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/namexujosuwoti.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/73241295158.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/26178063528.pdfIn PDF document text
    • http://standardamulet.com/files/files/7835653578.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/17742140146.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/dinosexe.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/66477871395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=is+rick+deckard+a+replicantPDF 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_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10428 bytes
SHA-256: 494daad4f4ff0566c1bd83b09d344274f99ec95474ebcbff37d0cf9606cb0e68
font_01_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 17828 bytes
SHA-256: 10802b7199fb8da045510bbebe1f3eaba5129c482c0c9bb486a6ff69234e395a
font_02_sfnt_off00015af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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