Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4da03a431aa407…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 16:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 631c88c4c9c2ab5b21a7820e18a6b453 SHA-1: 0ea766dc167e146c4f59123c1f50d19f55c9c822 SHA-256: 2f4da03a431aa407ea68e0bdbd0143ac03dc6e9f704d43e217a4834aaf555852
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are consistent with a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b3ae8c96---65030589547.pdf In PDF document text
    • https://jobtiara.com/files/files/vabesa.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/66c78a1dfa090d94ed4ba6e4901aac31/fuzapegitaris.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kuxawuxujepago.pdfIn PDF document text
    • http://kfbi.ru/content/file/81758926395.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e934d9fa7c01419f6fc089ca8ec42203/15764519887.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b1ec164033e96456706ebdc52eeab825/7747227711.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d687df9b82bcfd53f8fe898a5d78e6d8/nopipoxepupefigozurupav.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/gavutitanidotejifuduvivi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1d9jd1jdes0piv9ff1u4nm870c/ribamugonakopuwuxu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/98125806351.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/39007777351.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c59d87521212a0ca45377c09389cbac7/faxebalubanem.pdfIn PDF document text
    • https://coevent.ru/upload/files/rezepanunisaguv.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/laxenopumil.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/m78a6mdq5506u30mfl8cbk7v0h/vilekojamesixam.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/84420898622.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/sipimosawemeturuvo.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/7665837235.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vafebikis.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c563510f766---wesiloxalezewarili.pdfIn PDF document text
    • http://phunhai.net/upload/files/4828838687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=average+cost+of+living+around+the+worldPDF link annotation
    • 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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 17288 bytes
SHA-256: 953e94397c917a550cfeeaf62047f015bed2f1fb6b728130b22dbb9c684d461f
font_01_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FE 10988 bytes
SHA-256: ecf8b4c0a86b9940c891a06adce55e58e76bc9b57fd15f63e96eccd44be68b0c