Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d2686848c6f693…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 09:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5958b8a465c271f5978173b67a4b2127 SHA-1: a66552f8066c0ead102f09e517991e976ced13c3 SHA-256: 98d2686848c6f693d377e6160fe7ab4696e138986e4f6430ce397c4a1cd9c3cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, 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 link farm behavior are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=blackmagic+design+multiview+16+manual PDF link annotation
    • http://pxmonastery.org/CKEdit/upload/files/30702900833.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0c386810f22a46ef8c21fe241a41eda5/rodujagolipajasa.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/fakivazej.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/71962244329.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/xuwosadazupimi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/zadomefodugurafufunife.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082617fdd490---98542269380.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3dliq2ovq37imlotjo4rot79v0/4415214257.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/26911922206.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/83783714451.pdfIn PDF document text
    • http://jaika.in/images/documents/files/65679378451.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/63562221211.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/60499808229.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/jezuputukegalafa.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/38054209221.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0fdc8c1272ebbb68e5991c93eb9780c1/56539499192.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/aad366749a431708f73cbf9ad048f108/sadububotedanexojivele.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/40739534883ae707908fe4df42e6c8bc/79849243653.pdfIn PDF document text
    • https://bczenekar.hu/files/file/safagikewirefopusadas.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/452623ae812ef59b4e1286c6cbd422fa/47416621043.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bv552lsklp20j6jt611oed3b73/kifubaxipiwis.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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 11112 bytes
SHA-256: da949d9c8ad6239c3379fb2fe3a7614d3533f85e361c0d422ca2c57ae567fa2e
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 18028 bytes
SHA-256: 3fb38586d2ba1290c6c63843c7493d8dcfccc8054134f32496334dc0a1fbdc32

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