Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ce0bff4efc923e…

MALICIOUS

PDF

77.1 KB Created: 2021-07-29 17:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 091c6f76339a9ccf809e3b423f8af7af SHA-1: bc5786e9b2380f5af1220c918103be15e0febbc6 SHA-256: f9ce0bff4efc923e16c49e829c1779c6d183cae07199404b98d329eb5a59663f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/31514781710.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6e33ce9c---80714453242.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/xoxidogugapaduvuwofemivuj.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/20587416894.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/b3125a0b4d0fa30aa17770b80ec0f429/94702909494.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/23992696943.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/kkdjpt96bp9dqpc4f0lf3ckfb4/97814178023.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968b0d397d3---11797284563.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160840f0208f34---pigixemadaxidilunigad.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cd9g8t82po3forsrgrq6jihso/munitiluloluguweno.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zigofarobad.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/27973552447.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rogawulotokixibo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c933d7be316---99046301454.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/5830145254.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dewubun.pdfIn PDF document text
    • https://uangraja.com/contents//files/rexipiverokesopivam.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807715d77a0---fedoxoj.pdfIn PDF document text
    • https://t2sc.me/userfiles/megodalizuxu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b47b816544e244e0352e6726e90612d3/29216589952.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/werumurabix.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2759b8c468---5150096125.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610056479d7f6---15808461618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ashley+furniture+warehouse+stockton+caPDF 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_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 10804 bytes
SHA-256: 730f6044b9b84426c0cc5920471a1c768b20aa0bc48b2ed769d988149616315d
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 17184 bytes
SHA-256: 8af443095b558cd229c327acb27c2b7879eef1af48312fb5d465f6e204ac14e2
font_02_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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