Malicious PDF — malware analysis report

Static analysis result for SHA-256 0997124695ae2d37…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 17:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a319ea1893eb6ad8d8ebdf1e1324bae0 SHA-1: 8edb6249643ab13d84a09c5ec960e3b54f33faa1 SHA-256: 0997124695ae2d37a04047bc7b707043b112a543685cdfcc964dd5cdbaf1d456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to lure users through deceptive content or SEO manipulation, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://smidgel.ru/uplcv?utm_term=tv+shows+for+mobile+website
    • https://www.esfa.bg/root/ckfinder/userfiles/files/76425452773.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/5193534052.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142ca5f3c3ff---woreg.pdf
    • http://khyljg.com/uploadfiles/files/nepaf.pdf
    • http://accessiblevehicleservices.com/userfiles/file/tedibipukozevi.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/bobutivijasapagune.pdf
    • http://kehlux.lu/userfiles/files/34268441464.pdf
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/kedekawakof.pdf
    • http://canadanur.com/resimler/files/megetulozulivibijixit.pdf
    • http://kbautotech.com/board/datafiles/imagefile/mugexalisekowojozep.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407077b1b3---16262241164.pdf
    • http://belloverde.net/emailer/file/kolezukaragesu.pdf
    • http://ossokahve.com/upload/file/39738356495.pdf
    • http://agrocare.hu/ckfinder/userfiles/files/lowakedavijeva.pdf
    • http://kientrucsangtrong.com/plus/files/74688126581.pdf
    • https://znalac.com/userfiles/file/xevekedimajatarelokafe.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c948b8e2b---kimopasumapupufuxoli.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/38944467593.pdf
    • http://konferencii.org/web/uploads/assets/file/41781400319.pdf
    • http://dentistturkey.com/image/files/vusimuvoxal.pdf
    • http://qunjl.com/userfiles/files/dunawepigamo.pdf
    • http://jevades.com/aircraft/fckimages/file/vevakisivar.pdf
    • http://mnarch.it/userfiles/files/velatewipamusaxe.pdf
    • http://miass.realxenon.ru/uploads/files/31558264222.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_off0000b142.bin
1486ead68dfbdef681e788ba5883031ad5fe5da2abc598f21b3048ffc2585a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 10468 bytes
font_01_sfnt_off0000c91e.bin
52ecc00bb48b2c35a80e68ccb2ca0c885e2f7055272daf1e22b7ee2331487687
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 16940 bytes
font_02_sfnt_off0000f484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16792 bytes