Malicious PDF — malware analysis report

Static analysis result for SHA-256 c252b6edaf3176fe…

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 21:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b0894d73a3b576188bf8ed37250c849 SHA-1: d54b0f578eeac4c7046232ed0789b805c4fa2693 SHA-256: c252b6edaf3176fed4cdf4934616794a7fe096d539bc2e807be7df764d12e2e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=types+of+multiple+personality+disorder
    • http://artside.org/data/temp/file/timevunevedawuninobasu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160809823d9f3b---banovonife.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c8cb1255affad5e78cf9b2c97dce3577/16700991446.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/72its66fcu99g6gkr8kd5fqhuv/jusukijuzola.pdf
    • https://akproauto.com/nbloom/fckuploads/file/59708287305.pdf
    • http://ridendo.cz/files/file/fubodinarapamejemolo.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098839230eef---fisibugawelogugedajo.pdf
    • https://palcev.ru/userfiles/file/bojevu.pdf
    • http://rymwid-training.com/userfiles/file/19117733677.pdf
    • http://travelport.pl/userfiles//file/zutafojesuvijok.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd1c3a01d6---xibebotowodadojuxoki.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911f3aee33c---pugituluduzosufusaxur.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mujibajutew.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uchnq0lbfdiujbvde8ucesjkf1/komonaxisisulo.pdf
    • http://dianacb.cz/userfiles/file/lafabimipavarotigotetow.pdf
    • http://learningkey.org/userfiles/nuwokunufumofuk.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v13b66h2mafi7iu441cvqkq9ck/38003291496.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce46ba3dfa---41201044516.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1a11a15b---nedoviwutakorafaxanamosa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0511ce1c9c---wonamulirolepufatekugibu.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ld4go9vcir59mmdq47t8j6ddv6/birevuvepogu.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828099e8700---62906495298.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21905bb19---21013110067.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_off0000e867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16792 bytes
font_01_sfnt_off00010079.bin
2a070576f6e4454bc537022a7a8becbc7f39fe49c0ef826a62d42bdee9f1dd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 17584 bytes
font_02_sfnt_off00012eb4.bin
bdbedb15bc823dc2607480688c772081ce26311853e3bd0634ba299dcd5c970a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 10836 bytes