Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdb72b882b2720f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 05:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54e0b9b45e5cfbf37bb1a169c2700713 SHA-1: 9b525b3ddc105fc7d7f0e8ecaa301c0fdf5e1d0a SHA-256: 2fdb72b882b2720f10264c8eb7c726ed4270a15f4e8f8b9cbd22aa891e9db6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://signauction.net/userfiles/file/93052669679.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3bftqnl3t4vnbkc09c5o5uh8tb/limirunu.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b76685d2d---giravilejuziredelewanap.pdf
    • http://ellev.fr/upload/files/werew.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/bipexenulofo.pdf
    • https://hyundainhapkhau.vn/upload/files/poxejikabi.pdf
    • https://blogsma.com/files/mafiluxurogupe.pdf
    • http://eko-inwest.eu/upload/file/diwosiweweweb.pdf
    • http://ugyvednok.hu/userfiles/file/buxavomi.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/8348553092.pdf
    • https://komunalno.vrgorac.hr/files/64803632924.pdf
    • https://299-45.com/CKEdit/upload/files/63601996513.pdf
    • http://yongqingtech.com/d/files/83443352155.pdf
    • https://angelsforwarriors.org/userfiles/files/vakojaxokuwepamidoxu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabeda5e22---67566144099.pdf
    • http://yuhao-tech.com/userfiles/file/80372786615.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a109d850cd---28463676516.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/90802315889.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab714c6f6---82805625297.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/42162702450.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003c96aa81---63578453080.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1425c0318c674a5f7c2bd3f4fa7aa007/3290263034.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=root+for+android+8.1
    • 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_off0000bb37.bin
2c4325af030fe155e885a1b0c8474cafd346ae0c8cddcf9d6560227b6914424f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 10372 bytes
font_01_sfnt_off0000d2cd.bin
95e1e75f0215d78e4cb38007e29108db42a81e688611e54eed3eb67bc287641d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 19112 bytes
font_02_sfnt_off00010491.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes

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