Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a41666dc1b20b3…

MALICIOUS

PDF

89.2 KB Created: 2021-07-14 00:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d950dc0c53295ab1b0140a7cfc48b7d SHA-1: 61be74c15d82ede9f690b974c2ad81050421aedf SHA-256: a1a41666dc1b20b3ee7f286ef67ccd9e37c7dccee9688e9e405ed770e8645fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/63abc5726589dc66fcd58abd8acc83c2/tipujek.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/77fe9687c6eb9fff9cd211be9477afaf/vabipebemev.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/45de9807ec021d9ad3840befad40b19d/47505813548.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160790dc479549---55613990348.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/73790784123.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c76c91341fdaae4f74ff72e61f1935a0/38106489082.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/407d6a3771f91d0f34e191754a42fc60/99188009590.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/a8eae91d919eefc2828d6890b2d46688/18260700916.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/56333126699.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/zedonelikemopasip.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6a757re9ul5t1scn6fff4s7vgk/67225537978.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083210411ab1---62597060777.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7c23200bf16ffe814654d902844f5209/sijitexo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24fe909fe4---32971911612.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/82214663561.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/basizowe.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/543c8fcc89ab9432004d0464903a3ee5/88310597137.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rukoxujonutazidiwasuwisi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/livagi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55b2a21cc3c174d0e122fcee60111f09/5984452284.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xajoxafawekeman.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/m4e1rrvuf7bs5unm7dduhgv673/jititawujanimuvejeriji.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0a04262862c52cb9ece663fd92da437e/25481659002.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/17472093686.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b83e4648e---vulufir.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/47494037666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=miles+around+earth+at+equatorPDF link annotation
    • 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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 17684 bytes
SHA-256: 79e6a39108c9dd85c31f5375fb1a166430e139578c67773394e5c40135837fc9
font_01_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 10584 bytes
SHA-256: 17923c7e62c5f4c721966bb012a9ebe7d4f99632c3a5fc6e68108c4b738ce385
font_02_sfnt_off00013f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1