Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f43b74ea523a0b…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 12:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 072356cb88360620e4a8d4afa05ec9fe SHA-1: ff38763a4d0b9bd3264a684050c3179d59cbf3cb SHA-256: a5f43b74ea523a0b4477f99fa3fcadc250cdfec3f1b4fb67d7e254b36fa6a291
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://zonweringnederland.com/ckfinder/userfiles/files/35310005291.pdf In PDF document text
    • https://chaletsuenodesol.de/files/movekivenopusata.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075563500d3a---51799977621.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/10796126114.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/85186715575.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bce7cd607c3---birevax.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/4360895747.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/eb5114942e47a136fb1a567d22820b2b/kudapirupasebiven.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xojomojuwinajebe.pdfIn PDF document text
    • http://shahgrp.com/uploads/68739056968.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/zipalux.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d03a8a784d052ddca1093aecc9d686fd/47219714190.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/94f0e61ac379dd28f2c8d7254bff7f20/20721416962.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/32p99n3fi85qkge50lrb7jr5df/34072423328.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/00bb3fbcc43b8b792bf1b97582f1f252/susejige.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/bematisepodakarelote.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/3858240882.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/qoo5kr17isupuhu5glilonfsupunq4bl/pokudusadaketope.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/jomibibu.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/13526076187.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/pavikugegadu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/virirenonerunuruna.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/11467273763.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934a1e38cf9---98842000580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=coding+decoding+question+with+answerPDF 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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 20592 bytes
SHA-256: 28ff972f19fc072f431a62d9c76b3434a03d0db5dfe2068cf2c33c42307e61e0
font_01_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 10968 bytes
SHA-256: 2f9af2a80d0ee6c687c808ddc9b58783fb9ee3c6afabf86dc94704b04849104e