Malicious PDF — malware analysis report

Static analysis result for SHA-256 31943095d132cc88…

MALICIOUS

PDF

102.5 KB Created: 2021-07-25 01:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7242e7c8e15902f18f0ada2585abf99 SHA-1: 67521bfa26f88f51c6127a4dc86ab11f2b61f033 SHA-256: 31943095d132cc88d2897d6b515af80cbcd6930928470f2daba9d0f0bb0c4349
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and numerous external links suggest a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gsmontaggi.it/userfiles/files/94715003792.pdf In PDF document text
    • http://enjoy.sk/editor_uploads/system/files/52831960253.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3876e031a9988a120dc0fd4dce4b8cf7/mozesujezekijo.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m84spv79eq4l2b61sgoessbmd4/lutelitezowek.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/junarowekemox.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900ac21f519---88148466819.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/zinigufulife.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1fbd292fc---73714681994.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32257b9eda---kavofawaro.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57fd2a2fa---rinikuv.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f474a971efa---vewaxudodug.pdfIn PDF document text
    • http://gyobel.itpublic/file/tekadujemosegu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b298d1f700---80554956842.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/lenuroge.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dakunujonewuvedevudekigi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000a92e26---2841812916.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/duwigejotinaduworovadolo.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/87818686028.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6c84c448b8ee52a7ec3c54b7cae4ed0a/sabazuru.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nanigugazojetorip.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/21579816911.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/mizubavezegirizelubuw.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/10ab127854ce20d7e2002afc5e97b5a9/durususarozevidagineron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=asperger+syndrome+test+onlinePDF 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_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 16600 bytes
SHA-256: 952b9bde04f06e997eee03ccf4f2728041987b657d0f055a4257b3d8955694f3
font_01_sfnt_off00015b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17349 10668 bytes
SHA-256: e85dfa91e488aef7d21feaa84dc6b00a786b0cda2ac4c2251c6fca7e5a420e3f

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