Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eaba0eb84cc05e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 09:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07ff9d72fc5b5125170b4d58aa9a3130 SHA-1: b1411c200a89ed8b80604cfb2767549a3385194c SHA-256: b4eaba0eb84cc05eabd2894c8f5f0031f5b90721f7f87ba69e9adfc4c9b6a965
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The PDF structure and embedded links align with techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rosabaum.de/web/editor/files/vafakexizo.pdf
    • http://kprmk.pl/userfiles/file/taragoratavuxavove.pdf
    • http://flairpens.ru/uploads/file/98758288933.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/15845057739.pdf
    • http://nghieuphong.com/upload/files/67849876596.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jafetuzevomurulotegi.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gavozodijasowubegexarel.pdf
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/pejanefaju.pdf
    • https://gkia.org/kingkong/userfiles/files/lududuxokekun.pdf
    • https://dukra.sk/editor_uploads/files/lalivivixiwutu.pdf
    • http://flairpens.ru/uploads/file/81750310097.pdf
    • http://standardamulet.com/files/files/rirusafezutexowewuxon.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/89619694841.pdf
    • http://vijyaiprismcrm.com/userfiles/files/bumaleridomeg.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/xiruz.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d5124393---muvizibu.pdf
    • http://najlepsietorty.sk/uploads/fck/file/kisipibomomet.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/kesibiketo.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9d57796ef28cf91fa099865e28e6a4d0/duzonimawoxidoxedaxuso.pdf
    • http://oikoscoccatoarchitettura.com/userfiles/files/60245567699.pdf
    • http://newshop.jp/archive/file/xaxumidamozebesi.pdf
    • https://elminhaj.org/userfiles/file/furegiga.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbe5ed776---34817587031.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3631d2bb012b3a4d3e298321faf44e88/letaliwevonewo.pdf
    • http://www.contal-farmer.com/uploads/files/49582534831.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=put+music+on+android+phone
    • 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_off0000b41d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 16792 bytes
font_01_sfnt_off0000cc2f.bin
2d680ac5c1d105e0133143a38f76bd9b926709c43a96d29052d0b780094e343a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 14400 bytes
font_02_sfnt_off0000f05a.bin
2058e4298f20a42f08faf9e7679273f601445f2752dd6a5d18909483024fa29e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10832 bytes