Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3009a1b7d9be27b…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 18:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcf2800829b98d87fc01c217e67ba5cf SHA-1: fc77faa3e2617d0d4c26bdaad123073bc809b1a3 SHA-256: a3009a1b7d9be27bafee3d47d14cc29e8b3d0425fcec3615c5737b8186ae6ca0
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and a click-outward action, typical of screenshot lures. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://greatnice.club/updatefiles/file/30389611453.pdf
    • https://slide-bearing.com/d/files/kexabigovo.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/66340565183.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/wogesiluxeligegoxar.pdf
    • http://www.s-prom.si/fileupload/file/40115315600.pdf
    • https://thokhoavietnam.com/upload/files/32918925346.pdf
    • https://fobh.net/userfiles/files/nevukenumefopiropag.pdf
    • https://girl0229960192.com/upload/users/files/sumiwelunos.pdf
    • http://afro-safari.com/upload/files/2502686516.pdf
    • http://bluekeydigital.com/images/pic/file/31834818031.pdf
    • http://akinmedical.com/uploads/file/69052873491.pdf
    • http://ural-resyrs.ru/data/file/3962804109.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/22530179387.pdf
    • http://metabolitplus.ru/files/file/sobesorikaxi.pdf
    • http://www.og2c.com/images/file/zamege.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161459328e5336---govawejugizodofifu.pdf
    • https://justbuymeds.net/userfiles/file/futawubupopewow.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/10496124422.pdf
    • http://myconnect-thailand.com/image/upload/File/53275654883.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137894fde51a---75143266935.pdf
    • http://evola.it/userfiles/files/mabulofaxegejiwa.pdf
    • http://resetimpianti.it/reset/public/file/merapodegivefuwij.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bf7bfbb2---xemixiritevigim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convert+from+pdf+to+jpg+format
    • 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_off0000b0d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 16792 bytes
font_01_sfnt_off0000c8e3.bin
5d333864ddffd9622a3fe37fbb22f558f7beea3915e05ec1b9852a63f505d9ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 14016 bytes
font_02_sfnt_off0000eba9.bin
b7634ec120e1914255c2ffc75023a1a5f672f44b0e6984e1dea333b5dc8e5c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10764 bytes