Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e2c3bbd6dda043…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 20:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62f6cf1185b2b845126c87ac8504a2c1 SHA-1: f8c49b46cf8440f784e9c21697221fd53e527c5a SHA-256: c2e2c3bbd6dda04309455da380583f707e13db93faafa41fa7dc4a9732077cd2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://etasystem.net/userfiles/files/piburenotono.pdf In PDF document text
    • http://efcosmetic.com/uploadfile/files/fibabasaxobogadopani.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hjm0jen49obki5fgvu332n9pn9/ritaduponufuzepemefuzajux.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/riwuwedatosuneninewovep.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608784d7503e2---8389854030.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830caf58a89---moliwoturu.pdfIn PDF document text
    • http://recrute.fr/files/files/xinikiwuxivavu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/n7mor0eqc5hda14n39c6u100k5/fejeram.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc6f3c82bc---84079818286.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3349827498386b239db30b4a1b15790d/sujop.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/kesifarugimega.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35425794780.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aff833e64---lisinowugup.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/62930899737.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/90386840744.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/93010524812.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/noluxezenego.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/11993169264.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rugiseve.pdfIn PDF document text
    • https://ms01bet.com/contents/files/84873631855.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d52056ff6---76367563748.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb6bba7427---86051940965.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210722195543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=biffar+haust%C3%BCren+katalog+pdfPDF 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_off0000be12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE12 18004 bytes
SHA-256: b337f9fa8f39a3732c7b81656fd030db5201919968a3aea73b07be22c2ef5f0b
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 11216 bytes
SHA-256: 9e373880cf9c554c11dfaed794dff5694588dd48f627978973f156884983d1d0

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