Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89d7217445ec83a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 19:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45975c18c78b5f44d41159642a82e9c7 SHA-1: 69723bc0242239af89a304898f5c85f70463ea6a SHA-256: f89d7217445ec83a02906f561f324aaf527c903603b4081ac52daa1bc045480e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://zawodydrwali.pl/app/webroot/userfiles/file/jolurezaxub.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/javokegamumawawi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe1e36510---97687796821.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/60401651857.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/74878076889.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/42052401480.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/xeloxo.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/39892375576.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/godebolamuwuwavesimejun.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/muporezelelumilipoxe.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/wabesazirarobovupiz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613934d9ba234---sowezalenibirelulikuve.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f039d0f45---pavozob.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/sidigitivujukexenemarimo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/torapanuladix.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/kabefu.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/33309375238.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/847610250.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/76333234025.pdfIn PDF document text
    • https://oasis-travel.ro/files/29644439099.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9e038832394ff48309635789f32fd142/lizonevafupixela.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/dowonabejuxexoribenap.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lelubaweto.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/89577502599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+forza+horizon+4+mod+apkPDF link annotation
    • 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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 17652 bytes
SHA-256: b19f7f1e78ff43c8ef899ef6d9d8144ca6fa809a4e0e56ec81e1df36588bf23d
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10684 bytes
SHA-256: 10d2b9abea9e7438df646388c6c46cc9f1ba7a8b9e61df6f2a5aeead5e44a8fe

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