Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f7ecf67756764c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 13:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101c8a56f88f83494058ab45b138fb05 SHA-1: 47e27a7781f9ac2ee29ae2e81110096e5ddf2cb1 SHA-256: 69f7ecf67756764c1339c7835ca6fff28bd4714a4c9a3a993f93ba8dada32aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware delivery attempt.

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://planet-for-events.de/userfiles/file/76304017331.pdf
    • https://domilot.com/uploader/files/71513677956.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1b841fdf---31350115356.pdf
    • http://www.hussco-steel.com/husscofiles/files/43804006903.pdf
    • http://christschoolblr.in/userfiles/file/tafegaxilisada.pdf
    • http://studiolorenzino.eu/userfiles/files/rilagolirenuzeragivus.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/motozodevazo.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/tatidinu.pdf
    • https://underworldgear.com/upload/users/files/55705497025.pdf
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/77442849068.pdf
    • https://poganyvolgyi.hu/userfiles/file/75655462553.pdf
    • http://djpress.pl/Image/files/datozixosobatatadu.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/75415747418.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48028c1fb---36242244259.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/78m5lve84g60boq0s927lejbc0/dasidulomuxitolid.pdf
    • http://esistore.be/userfiles/file/busibigasupabisozi.pdf
    • http://youil.org/userData/board/file/33342583960.pdf
    • http://ylphs.com/ckfinder/userfiles/files/33141461211.pdf
    • http://blfimmobiliare.com/userfiles/files/39062490488.pdf
    • https://interior-mark.com/ckfinder/userfiles/files/50835625441.pdf
    • http://lokalizacja-gps.pl/userfiles/file/bezituxefosoxajasuxigur.pdf
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gosorob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=network+usage+android
    • 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_off0000bfc5.bin
0060a7bc82805d9b3aac55fa8837a22fbe20b95d5416ecb417f55a88f4ad7603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 17908 bytes
font_01_sfnt_off0000eeba.bin
8a2ee300cffd32d7f3a15fff887a8a1004e516d50b09653d42dca05e9dca516b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 10632 bytes
font_02_sfnt_off00010719.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 16792 bytes

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