Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ab73698e4dbd63…

MALICIOUS

PDF

106.9 KB Created: 2021-07-03 13:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 849466e5e9e05dedea83ae7a9fcbed0a SHA-1: 44e016cf45fd84eafb4b8ae82bb82c725f514a39 SHA-256: f3ab73698e4dbd6359e88f127aafb60f9c7003fd6f9c009f015fb967ade456ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://nutronicltd.com/userfiles/file/tejekiraxuxadivimidetonik.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/add55a3c8aa44b4c45cd56f12c19efc2/62093566041.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/89010139850.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ce850936---kemetiwigogeraxo.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/pekeguvavi.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/vasarumomadomirujurom.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401213b0f8---dokazeg.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xazekubara.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bc56f940bb5dd171f88cc53bf232175e/valolivebupu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/31363074452.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29301f5b7---katomugupo.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/72543902390.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/75c9b050b86aec4c20237f26cda2f21c/47007668794.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/68700260100.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2e8f6fc8e72454f6e2ab5676eb21ccc7/mikiratuj.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/49689259027.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a2de2e5eba338abe6a305e20564e9ead/46303077353.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s68qg5dll9err3lno3jnadbtst/duxadarimikomebefometina.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd652db604---wirevuwigenamibuloke.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a705986288fa6492e8e56024cfb44064/76822575671.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xekuxipafizol.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f032057fd7---kunovogod.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a477336d0ff335faf9bbc511e0c58f12/12754671089.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/43414364287.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/035d0e50b913a62f85d6f8467d3d53da/30249489878.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/nufuwogobozupevuvemipabob.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tatuzedavigafod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=miller%27s+ale+house+corporate+officePDF 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_off00013e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 10600 bytes
SHA-256: 79406858d3b0865bf9095554e00db99142632b7ef3ec9cb2524af72c3eff8b75
font_01_sfnt_off000156fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FB 17712 bytes
SHA-256: c6cd9646bd8b8f365f22486684e3a87796c1724d556da88bdc7685f9c17012f6
font_02_sfnt_off000185d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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