Malicious PDF — malware analysis report

Static analysis result for SHA-256 6064593540b690ec…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 870e056b4085ed6fb63ce8a0e3d66818 SHA-1: 7f2d95552d9997a92c76443d2411e1a05af0eb1a SHA-256: 6064593540b690ec27fd9542603dcdd2f996dc9e871faa49446fe30bafc78493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external URIs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=food+truck+business+plan+template+pdf PDF link annotation
    • http://areaengineeringsrl.eu/userfiles/files/90448291268.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/litioqrod15ov2bds96mf4h204/53706633423.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/gubojokewu.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/88932218659.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612759493feb1---19730096088.pdfIn PDF document text
    • http://adriennemason.com/assets/files/47377716210.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vekedotewezafetuzosafo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082438d43584---76161709004.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/69347618497.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f206e97ae4---95045785490.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/794cbcf07b2349581f785b4af6641526/wobatinixakowuzisevo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119aa199ae46---wigodoxazutudazojuzok.pdfIn PDF document text
    • http://apex-architect.ru/images/file/milasoxapiki.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ridotip.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277ed0afe93---jamupegavu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zefasaveloma.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/v890vmo6ad7nvb4oten63i4qps/jawadovegif.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/28820225053.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/losatukufugilijegafis.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/lufuzolituwemozi.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/zajovixiwunozurewo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16125799579940---34490810385.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/38579097800.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/b9tp5f76hjjrrf0evde16ae5to/57509684740.pdfIn PDF document text
    • 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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 17388 bytes
SHA-256: 991953831b3830bb524e03e721537273cc14ba9da4b4d6547b69e92b76f1a1b2
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 11092 bytes
SHA-256: 963ba0d1851b164373e3f67297d51cd4622fe34d9eb428e1eab12d86c3345ed9