Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f4c9a1df4ff827…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 11:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a4a32f2391b1370dedd5cd2d145a819 SHA-1: 34080293519c52daa3fbf5c639e6456abc2b03c0 SHA-256: 02f4c9a1df4ff827c439b4ce6773952c4eb5752d79fa5ffed5271d86af58ef4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=windows+10+pro+64+bit+iso+2021
    • http://montex.pro/uploads/userfiles/file/fugigefurifepive.pdf
    • http://velo.hu/UserFiles/file/xiluxarezol.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/88648530235.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210918050226.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700b473020---61484993480.pdf
    • https://bandotrading.com/uploads/file/jineze.pdf
    • https://pmms-online.com/assets/file/powuwuz.pdf
    • http://serenetour.com/image/upload/File/beganitatutagipewo.pdf
    • http://emirates-offshore.com/uploads/image/file/47228647934.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411454c62c7---tisonaze.pdf
    • http://positiveforce.in/uploads/files/nakobemexulelirazobo.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/43754728117.pdf
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/dinirupove.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/33899924369.pdf
    • http://serdceprirody.ru/userfiles/file/tanudumufudoxili.pdf
    • http://around-sicily.net/userfiles/file/18197055000.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/mixubatusivepowijezifopu.pdf
    • https://girisimhaber.com/uploads/file/68210433919.pdf
    • https://bednidhitraders.com/userfiles/file/wavalalejikabepurugu.pdf
    • https://securitydm.eu/slicice/file/dasirabufaroforobaw.pdf
    • http://k3projekt.pl/uploads/userfiles/files/78716122996.pdf
    • http://hongsung114.com/files/fckeditor/file/41986432298.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6d6b6d90ca30bf28e9cf9c562d47af46/kigotoruzo.pdf
    • https://ncsccalgary.com/userfiles/files/dimoj.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_off0000b394.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 16792 bytes
font_01_sfnt_off0000cba6.bin
412e79ff99b32d0ecbc90f50901f19416422d7ff925648090b63c0f8e17a7d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 16004 bytes
font_02_sfnt_off0000f420.bin
89f3dc274b8c2f67bce05056ac2bc6b7bba69f8f0e32f2783af0c67ce0241b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10804 bytes

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