Malicious PDF — malware analysis report

Static analysis result for SHA-256 13355c8aa4d61248…

MALICIOUS

PDF

67.6 KB Created: 2021-09-27 22:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fbd2a977e475de281890969548933c1 SHA-1: 84dbb758bc8b274c787c6e9337117fca034d5bd8 SHA-256: 13355c8aa4d61248784aaf8fdd38034f836db107544428262c0ad527c9c2a9fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking a link, likely to a compromised CMS upload or disposable hosting site. The embedded URLs suggest a link farm strategy, common in phishing campaigns aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=stand+o+food+android
    • http://yangs-ns.com/ckfinder/userfiles/files/20210918110929.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372bdf568ac---jalitel.pdf
    • https://photojet.bg/userfiles/file/wotiravemikub.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130b46a4dcd8---62732449903.pdf
    • http://df-2.de/images/daten/file/dasene.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/45426703876.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/dde582d3d1cbba5352f173fb312acb34/tuxefa.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/rufabapenokibo.pdf
    • https://stw-nowogard.pl/download/file/83368235811.pdf
    • http://dagmar-e.de/userfiles/file/17091735229.pdf
    • http://champagne-marc-chauvet.com/images/files/vikemubitafarutapu.pdf
    • http://naim.naparts.com/images/fck/file/genodo.pdf
    • https://777mto.org/contents/files/farek.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf3fc20a0e3c13211fc555f212a73537/35270751132.pdf
    • https://upaspor.com/resimler/files/segekawavunukul.pdf
    • http://chinalabware.ru/d/files/vikomog.pdf
    • http://gammatradings.com/userfiles/file/weninobividuxutetitib.pdf
    • https://alubiasdetolosa.com/files/galeria/files/vorosiradozo.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/34a28fe506278912369f1f29957612e0/83293497595.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3a64d61e---gebebuvunepesemitofinov.pdf
    • http://dajuicebarus.com/uploads/files/85186981583.pdf
    • http://thaisomboonautopart.com/userfiles/files/supujabova.pdf
    • http://lingeriedediva.com/UploadFile/file/2021092711560273499.pdf
    • http://wawa757.com/uploads/files/bosiniken.pdf
    • https://ln80.cn/filespath/files/20210909093757.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af7d.bin
90ca048a86f4039f811f236d00e8d8156525f42f96c546581a60f962b513ef13
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7D 14080 bytes
font_01_sfnt_off0000d28e.bin
6dc64e4ff85a1fec7ea2f30a6ce5a216f434c282cd49a6b6d59c68bab9cc5407
pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 10076 bytes
font_02_sfnt_off0000e91a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16792 bytes