Malicious PDF — malware analysis report

Static analysis result for SHA-256 665867a20b7afc28…

MALICIOUS

PDF

68.2 KB Created: 2021-09-09 11:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b340a67d688202fdf55e7678ca43cd74 SHA-1: d54ce7dbb0c460e52007a8b1036d6e34173b20a9 SHA-256: 665867a20b7afc289949a3c74ebab9f74190e21039d5b0a3cf7f8d351fb70844
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-heavy nature and minimal text, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it's part of a link farm pointing to potentially compromised domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 2 text block(s), carries a click-outward action, and is only 68 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://dolnoslaskialarmsmogowy.pl/imgturysta/files/24235554248.pdf In PDF document text
    • http://snft.ro/media/file/tivifiz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/posemuput.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/ruzomubuvekigeri.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/mezexedenosagi.pdfIn PDF document text
    • http://annabarons.com/files/files/nalipo.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/87460045070.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/fukatetozamowojeliki.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/widagamaminog.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/84975673224.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136a33d995bc---tizowomazijafu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/leluvixisizevapuvoporixe.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/4650558081.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/bulama.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d0aabb89---kajosoletogarenazinus.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a64b075dd12c45c8965b1d073a2fd013/61619092141.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dd8223c28de8f58d69957b3b849caf45/47897332163.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/45070433676.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210907_E7365EF25144701B.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/funadapobo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161312ee4574ca---55065279546.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/50161234261.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f971bd0---poxedewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=easeus+mobisaver+for+android+full+version+free+downloadPDF 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_off0000aee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE9 14240 bytes
SHA-256: 5d3ea5185b0c7671eff090f542c6456a36c8972fe9f18388990cc6d70b04c63d
font_01_sfnt_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 10792 bytes
SHA-256: ceff1b458870d95d9dd250c652eb46fe571f0334f91b4a2d36462a59283c64cb

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