Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68729551f6a70bf…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 18:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55ba0b8d2a7f4ec41c37d417ad7ad13a SHA-1: 2c0ea50d31c65ae9a8f2112e7e410a36559b73e7 SHA-256: c68729551f6a70bfa2c92493c7396efe7cf1f62ed206af5ed6153be35ec5cf93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting sites, many of which are WordPress uploads, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=financial+statement+template+pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84114a66db---22176045732.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/af3708fbd872356989f9508c9e159b18/54946593757.pdf
    • http://absolutelyneon.com/userfiles/file/sobopokogawovegawugi.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b34da01fdd098433a595f8a3bae2f298/86601961920.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/9c98f5db734bc0e489f68753d89995fd/pitoravunotajonamune.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-9/20210509010409417920.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aabiqk735p63f549845gmd7nl6/nugubevimumozava.pdf
    • https://zlato-eu.sk/upload/files/64159769900.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4875d42c60---jiwujafo.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f2eeefafc9768d915e5f251d65b92c3/94958653989.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3a388c3---mewem.pdf
    • http://jun-travel.com/userfiles/file/84945349323.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8b167399---suxuruxifirokelasuw.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/xudojiwigegugowinize.pdf
    • http://agcslohian.com/userfiles/file/13382079451.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/045cd4b0fc0d34273dc500e202e4b783/kobubagevivedo.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/59529346546.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c915a444---wutiremokulofosa.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1672b5c---65977755089.pdf
    • http://botosani.ro/img/uploads/file/70729847630.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3b97dfd7---lekuzotogelugovo.pdf
    • http://kayapaliinsaat.net/file/73736360256.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/tuvikijigogawadetowitida.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b992c3c928---11525664267.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a063c52893147dd8bce3d3eda31030b0/17180355323.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_off0000edc4.bin
33652b0d4cd30b1e7a88155fef882987d860833d64f1b70cd94f3c56a918789f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16524 bytes
font_01_sfnt_off000118a9.bin
51ce50f217dcc78fcffb121f4ae3d2a6d545a6cbfd0f6ccf1e68affbb5eb145d
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 10536 bytes
font_02_sfnt_off0001309b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 16792 bytes