Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4670c08dadc875a…

MALICIOUS

PDF

118.7 KB Created: 2021-06-14 12:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d44a6dc158e4ecb58706b5af20e6b29d SHA-1: d2d5b744ebd9c5453e2bd8461ebc5b41a8be709c SHA-256: d4670c08dadc875ae7c5b83a3ada201b27aaa2372c5e10292d54bbb185f20f1a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=convert+pdf+pptx+online PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0806cc7d33---nakenusugikixa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759086536b7---64175048402.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/fifel.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f3024d0e---35525668895.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/batanume.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/25158606757.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/65092308021.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/nenademakavazu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nenozipekipi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dfjmsf3iifqpb32q1bbol7cfc8/13069551934.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15da9e10d---jodemaleponovujasowe.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbb070afb---fowegowelesopafeleb.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756fae17072---48335305913.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/27823899494.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 55852 bytes
SHA-256: 04d659e6233370f6b1da89be31de347f0e1a01c014becb26c07f12fdd61604c9
font_01_sfnt_off00017a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A06 4680 bytes
SHA-256: 2bd77de7089b89216d88c8641c6a979e74632d8e33b79c3461d56c66b0c10114
font_02_sfnt_off00018a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A03 2468 bytes
SHA-256: adb0046dc9b7932d58b47769b478606e55b9e2af23b2525de80cf856830ec9ca
font_03_sfnt_off00019517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19517 10748 bytes
SHA-256: 5b3238093ad2a8ceb9becd062c85d5821c6337d083e0ebce33ffd6313e7b95d5
font_04_sfnt_off0001b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C6 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550