Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5e44362bbf928a…

MALICIOUS

PDF

71.4 KB Created: 2021-07-06 05:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeb18f4fcc7467f0bcf6e53cbe0caff1 SHA-1: 605b058d4cfd54afee661601917eae718bd0d758 SHA-256: 1b5e44362bbf928aaae15f8bd2ea33f57d3d9e7655811d7ca062b8ceca584628
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/fb2762027d889c0982ee7bca63669447/pujonabesurapomi.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a544f4856dd---luwuw.pdf
    • https://angelsstaff.com/uploads/file/95632542485.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/48073064567.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54de95b52---guzadanavud.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fec13dacd---17400558092.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df43c70b378---mopomutojunejonazixakowo.pdf
    • https://presstone.hu/userfiles/file/69394925175.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d89f2d41---10631235247.pdf
    • https://fotojursa.cz/userfiles/file/96838686649.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996428cee93---27702318797.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d988b9a52---75276928211.pdf
    • http://accessiblevehicleservices.com/userfiles/file/fajabogofoxiturobino.pdf
    • https://bandotrading.com/uploads/file/31745579742.pdf
    • https://energooptima.hu/upload/File/barixajerugexinetaw.pdf
    • http://tuzvedo.hu/elemek/file/vuxowovo.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987d500574b---37888510326.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4r84ea66l1ar9b9qqn4u0je0jf/54426056874.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb43b09fd2---71979902291.pdf
    • http://splogservice.ru/content/file/lonedapifizunexasopop.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ac16f0369c7d5c094f2b3ff33b013f2b/75168901772.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/06tb5d1kjs1ppkh7ovo3e77vuj/gisow.pdf
    • https://tcremich.lu/files/files/vuwupowebejef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+find+scale+factor+of+a+dilation
    • 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_off0000b7e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E6 16792 bytes
font_01_sfnt_off0000cff8.bin
18a0386cef3bf840d2b7390350db9aa05bd7a84e513355feb972dc8a3f65db85
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 15512 bytes
font_02_sfnt_off0000f785.bin
c7051fc6bfc9a7520a4a0aeaba459877a7e8f8bd2ccc3d910386e8c3cf6fd68b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10760 bytes