Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb61e713955e802…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 23:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68a19b2d9f08084b5334dd5c99eef860 SHA-1: 2df4b5f1b1ede9c5dcff8bf8e921609df5cbcea0 SHA-256: 8cb61e713955e802b99a9f378e986481f3a3a9243340fe5ae488fbba18fe624c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=difference+of+plant+and+animal+mitosis PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142e88a7dd38---57491079306.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146457d0b2df---36295580981.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021917536157288.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/71830939577.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/17297303664.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/manipepaku.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908022849.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/movomatubimosujenil.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/57861111049.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/lagexewekelalid.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/94373555436.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rijapilop.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/xeterelosuriratejidefez.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/72901226342.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/96244011189.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/40454724403.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/fokusek.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613771dbd6f7f---zatovimima.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/28785611246.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210928112100.pdfIn PDF document text
    • http://chromavials.com/d/files/sageminoxig.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee483825c2---95718534338.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/301820374600.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/fiderifafudugosulip.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/bagezisijexuw.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903224634.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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16720 bytes
SHA-256: e10f19bfe26d2ee873b45339308a45a885c9356cf29d23847563431686b31eb9
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10780 bytes
SHA-256: a399f0419dec8bc1d114b39cc41580fe92cce48ab56c85b388784fc64018f0a2
font_02_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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