Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef8205004d2abe1…

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 14:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0381eba4d2e3df771b2727a195638ec1 SHA-1: a9ae6e510134b7f6aa887c8184087d36a1a76027 SHA-256: fef8205004d2abe167135055174e028ec25cdc3a83a7628a29eda028c9c99381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures, often delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pm-ural.com/uploads/files/44848472181.pdf
    • http://fuku-zou.com/userfiles/file/2156188788.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/mimis.pdf
    • https://rhodium.vn/uploads/news_file/10728061426.pdf
    • http://www.poliklinika-hb.cz/userfiles/file/97796500655.pdf
    • https://sharjahcements.com/images/bulk_images/files/94503352417.pdf
    • http://pitchdecor-construction.com/user_img/files/dunufalalivixe.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6511dd4c0---tubutuvemov.pdf
    • http://elmbbq.com/uploads/files/mobunoxuwi.pdf
    • http://exima.kr/userData/board/file/xowiromiribimotelu.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/liragegij.pdf
    • https://paulogomeslda.com/userfiles/file/dejepimixamudiripopefut.pdf
    • http://artdealer.vn/upload/fckimagesfile/e95be304ba611122af5ed00feb9049e6.pdf
    • https://ltssinternational.com/res/wysiwyg/file/nitapetedewawagatipukuj.pdf
    • http://sicilalluminio.it/userfiles/files/79833948598.pdf
    • http://fasson.vip/images/editor/files/20298067878.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f735b6b10---kelujadugovipufu.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2d773319f1761058065e5fc0b88c0967/kixubifi.pdf
    • https://galerie-louise.be/userfiles/files/wikagabepigedokeve.pdf
    • http://av-jet.ru/userfiles/file/betot.pdf
    • https://toppelletmachine.com/d/files/nizoxepim.pdf
    • http://prosefkuchare.cz/userfiles/53158822114.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+games+like+mount+and+blade
    • 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_off0000f891.bin
b5838b306ee8412460211a3ac663cb485fccb3eb07c970178293968cea3ce9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 17744 bytes
font_01_sfnt_off0001261a.bin
01cd71fdc90f7a552008b91f88267ccb97fc18ab31d50def410e97b41ab7f154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 10904 bytes
font_02_sfnt_off00013f25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 16792 bytes

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