Malicious PDF — malware analysis report

Static analysis result for SHA-256 58259efd4340b664…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 01:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28a483a17b88f7c38ee11465e8b2eeea SHA-1: 3b165f4600aba2b5d9b97e8b3e6919fac632aedb SHA-256: 58259efd4340b664d0474030db2fbb2fafd01302ddb900b4cfde53b88985b732
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and compromised CMS upload links points towards a tactic of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=let+me+hear+your+body+talk+song PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a08f03c8---galitet.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/riritibobapumigo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c35623b3---10205885112.pdfIn PDF document text
    • http://kco.su/userfiles/file/pasor.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608554a128ac5---86005987566.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8584aa46a4---19755770743.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xikamixasuj.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/53735602516.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/75300ec5864825548a15bc70c6061a80/bikipapimezepege.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67008dcf1ebc2d3192c399780901d432/dipimokadelusu.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/20211483430.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/22002636585.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/49782213390.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/95098041738.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/buzodikilazogaxapikipen.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/84347168238.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9s4ksdo0uce6a8vannu66a7a9m/vinukaleru.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/73587f8169042e8bd843b80241d0fe40/34300540120.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f720cbbef---raweviwunakazanilazefoxo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbdb5b9acf---doxunavuwovezuraf.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/p2h25fmvkvk6tt8fms6i4cq6kr/tamikinosirivejevo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0bb9b42da2e99cf7c206bbbb411a7ab4/57283118416.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c9eb36821---pozoziriboru.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/24107477001.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/71066710924.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/62a6b9d68ed8aee012cedd071090d823/kivivamo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e170bfada9127d8e6ce7507d7b2edc0/futiponewiziler.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 17248 bytes
SHA-256: 6ebedc1ac9140c03ad6ccf098aca5a4deadb305d83b3a95654582f8250c51590
font_01_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 11004 bytes
SHA-256: 0dc07bb3039ad454ed68f26f0df8384cfc44405cbcd74a82f6dbee600e50da99
font_02_sfnt_off00013726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1