Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ef976b430cb3fd…

MALICIOUS

PDF

88.0 KB Created: 2021-07-29 18:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a2527b3df1bb4302b037ddf28b7f10b SHA-1: a66391d487828374440f87a343d197e252dad082 SHA-256: 98ef976b430cb3fdc38cb854df8b09d0615a0322092a9bab5801bb91561ba22f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=codashop+free+fire+diamond+malaysia PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857d221bd0---zejem.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48161363743.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/31428872659.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/93765296927.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/12vc6k8fob7uq3jmnuji0sna2b/kuvopupemelex.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f15938c64---godezabasobibepoketitur.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/82320245152.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/puliderodenigababi.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/wolifuforopomiwebawovo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pezunok.pdfIn PDF document text
    • https://schmitz.cz/res/file/gafuviginiva.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d810693dc---23155762939.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/79807002786.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/487a5c6b4b72q7ocbe1ehj0971/panobexemosakamaxabu.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/21171914817.pdfIn PDF document text
    • https://buka.ru/sadm_files/39293899450.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/rkc5mp9hrkj4fmm6ertrlv1s95/9465907074.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kezejezipefi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/97210320565.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/80dd26677e7750966e400c5ddae07053/97401847557.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/botusirosanixadesep.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/292771325.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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 10808 bytes
SHA-256: d9162b68b0acc79c98e5c2e9098f7b252bd6037e266ef10c4ba3cc1e0c7131a2
font_02_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 16816 bytes
SHA-256: 43d30e73021b99903283a90e1cad7c35d9fb885058622478c26e737f3db3bd82

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