Malicious PDF — malware analysis report

Static analysis result for SHA-256 93be5fa2b88c5726…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 17:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3d5901fb0c1dc4380ac9bad174ef950 SHA-1: 6cb25bcfc818a26d4e1732eae9eecf00ceefcdf8 SHA-256: 93be5fa2b88c5726f792e090a63cb71f6825445687465a5c505e5ae1120e2852
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'callback phishing phone lure' heuristic further indicates a scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=browser+on+android PDF link annotation
    • https://dijitalsanat.link/upload/files/razugosowipovarejoj.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/45887975547.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee1a75e34---kotivadezamu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/bigesuroxi.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/kufofemitumimonezim.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091321475873499.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/20581838569.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2075e93cf---12154902340.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/xodiwubu.pdfIn PDF document text
    • http://palami.by/images/file/86758428024.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161473430aea9b---gureguwifaza.pdfIn PDF document text
    • https://norservis.com/files/files/pasabajeraba.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/87552424933.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/8509327245.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/pumolujuvatemaxuxu.pdfIn PDF document text
    • https://wittnebel.dk/file/vumof.pdfIn PDF document text
    • http://topstec.com/d/files/nexobumogujukej.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/vuzagijorawetipije.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/javipoposujasev.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc5288d5c---90839284344.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fimisesolodupa.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/68702200.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/98511384187.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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 17248 bytes
SHA-256: 09d6a2aeab638bd5488be8dd395a8ccae09b39eb722c2f23846e5bddc41493cc
font_01_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 10236 bytes
SHA-256: 0b901d959b99dce64cea01e953b9ed17a30d9efcac15cfd2f631842b09b55e2a
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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