Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7961d7d063e3132…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 07:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6f2c30511bfcfe0852484d37e262d62 SHA-1: e34429834d87acb548634b8023afa4b4035e5d20 SHA-256: d7961d7d063e31324c125de48e35d7097b29b46bb22061c9add1fcce525ffceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or link farms, suggest a phishing or malware distribution campaign. The file's structure and the presence of external links indicate it is likely used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://queure.ru/uplcv?utm_term=plato+philosophy+books+pdf PDF link annotation
    • http://adamlegal.com/userfiles/file/90362751418.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d0b0c99d5d13a7ef6a02ac48ce3aaea7/lukuvevuzixezizev.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/20807102232.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ff98e67382960fa1cec81993a9378b6d/daburubokadexuxaxuro.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9d1d9f848acbd3fc1aabf5380d346403/xadunedid.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/19614048959.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/kupasuviw.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/vujuzotujoretoj.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/tanapilo.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/72079867553.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/16116329659.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6ff1f31631dab95e02b3ff79dd5a2a70/75169520603.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/92bb9964b262b7e53d6000a1ae0911e3/ruvavufazugavilesopix.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zobakizekirefami.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/tuzopetulefibujikigisefo.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/01qu7kttqd0raole9lng9binch/7511356116.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/76341578835.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5e4404e374788506988735eac46f3a9f/pebexumefubit.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/74365257081.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df52b633cb2---kafexukabu.pdfIn PDF document text
    • http://erpos.sk/data/files/88892746373.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/9294236494.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/virunovuzekabonus.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/litebavegewevis.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/55924027438.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mawetikofo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/48641037163.pdfIn PDF document text
    • 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_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 18864 bytes
SHA-256: fdb3488bc94e78c0aee257c4294050f2e1833415b29b9494838c9f900e5fcea2
font_01_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 10608 bytes
SHA-256: 47223cbddb1124ec61fd0d2ea812929e51dd080a64c573112c6438b9880e16a7
font_02_sfnt_off00014cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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