Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1afb0dfd081e3a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 05:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff0c34234abaf1c7dc87b14b0f6daec2 SHA-1: 2d1d3d5ff3a0b10074436e369c6f6a1fdd288fe1 SHA-256: 8d1afb0dfd081e3a28707810b8a7418ff99b6d4de13776ed458cbaa7cdd634dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://banglenhospital.com/UserFiles/File/dojerowodoke.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/73384252497.pdf
    • http://tehnicgaz.eu/files/file/81256689602.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e84dc17d96f63cafc43df36a33786003/63293266871.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e655ee3cd86---50029831069.pdf
    • http://bassbasement.org/userfiles/file/13688292273.pdf
    • http://strategie-online.net/catalogue_dynamique/file/26648003820.pdf
    • http://ac-kenigsberg.ru/files/file/sixaj.pdf
    • https://zhansq.cn/upload/file/pufuzanizenarogas.pdf
    • http://kcemsp.org/upload/editor/file/rapemaju.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ihsgod80fqmeflmmthkh1b9hq5/sinove.pdf
    • http://asesorgubernamental.com/images/file/90362422868.pdf
    • http://dsagco.com/Upload/file/giruselexenitozesaxa.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7d27e872---koxaxonejivebadedakedoli.pdf
    • https://shiokerbau1.com/contents//files/94306103803.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785c990f4d6---xolegesokabinolezobef.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1627815536.pdf
    • https://le27.fr/docs/file/berezadobatopaf.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/zutevaduwa.pdf
    • http://oklogistic.lv/upload/file/72361773338.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/gidetus.pdf
    • http://vigova.vn/Images_upload/files/xosujoweresezuposuzo.pdf
    • http://drairtools.com/ckfinder/userfiles/files/27733016612.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=information+technology+nsqf+level+1+class+9+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d1.bin
e3cc75624af66dcfc0b6094c9baa4d121e6e4bea0cccc31c50216aa0345faf26
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 19512 bytes
font_01_sfnt_off00010a8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 16792 bytes
font_02_sfnt_off000122a6.bin
95cb392bb81073d5b735c60cfd4da7d397a6cf28ee43204a5739219246e5414c
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 11564 bytes