Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8b90788dec02fb…

MALICIOUS

PDF

100.4 KB Created: 2021-06-09 07:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dc2f006103792227463f52ef01022bab SHA-1: 86f5b5eaf8e77830f1118576ed67f188ba6ef43d SHA-256: 4a8b90788dec02fb11f7ccbf7141dc148e8e0e580a118e5d65c643e15ea053cf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://infrive.ru/uplcv?utm_term=durable+building+materials PDF link annotation
    • http://brandnewgoods.net/userfiles/file/92831624124.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db26eae3b---salenopekeloturimaxepan.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/80584555135.pdfIn PDF document text
    • http://askort.pl/Upload/file/popuwuxemuzuroxokijesoj.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/13512732312.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a437b69762---31040442015.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97feb0bcd---83517900160.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72950988d8---wurijub.pdfIn PDF document text
    • http://www.asslar.de/downloads/27756806335.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160842a6e172ca---mufonavozijunaxeve.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hqvs049ce1umkr1etd5qmag7k4/63939604932.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6cc1ad059---20117679840.pdfIn PDF document text
    • https://capecoralliving.com/media/file/jisonugofepubetusanerux.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tklvprjb2vmihffg3ccq4er6lk/18836472852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 6200 bytes
SHA-256: 9dbc639ff8c0ca884c16a0751278a55d5318e4c3269aff7638b8d7e4e0a43da3
font_01_sfnt_off00014b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B26 5284 bytes
SHA-256: 9a17d0678b4cfc71c1d4b2e5943bbac13d54fe69b9fef6e1ef6b395d4e2ff7f0
font_02_sfnt_off00015d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D05 11776 bytes
SHA-256: df757df0c207094a3210f622c0522affa00d301acfaa6bd7a7302c34a97abc3a

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