Malicious PDF — malware analysis report

Static analysis result for SHA-256 3587c8deef1bce76…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 23:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9ab20c147466a3e3e37b11505fa5793 SHA-1: 0604abd8c6695acb04492a27f1464c6a6332e44c SHA-256: 3587c8deef1bce762ea9321eae05432b8ac33f40cc8424fe2bd8f77e1143d8cc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=steel+and+flesh+2+hack+apk PDF link annotation
    • https://angkorphotographyguide.com/userfiles/file/78642923787.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0932fbe847572eead4eb9763a768cbe1/13119859444.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/komajejaxisusunasaro.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/ganova.pdfIn PDF document text
    • https://jetaime-shop.com/files/vapedejijavanumewiwex.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/20440492194.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/mezodumajakes.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0077265850ccd7c79cef6c439a6af783/70148710279.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2tq644s25bvtgffbbnl6rv00m3/fufozajogodi.pdfIn PDF document text
    • https://codecs.ro/images/file/65633013124.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zafakavobanelusona.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/84880371777.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/94033833493.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/46569214042.pdfIn PDF document text
    • https://wasael.com/userfiles/file/zinidazodipuzipisudumut.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/tamakivotovo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fdc0e8629ba76c419c574263d95bc7b9/263370141.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/kisovaj.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/gufudagolikizowefekodeg.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jqn9serslcigjt8p6n5gomfcco/58453694986.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/81274593846.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/55169712046.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109192213503168.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/97597778688.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_off0000c1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D9 20172 bytes
SHA-256: 2f72d0ec470e61220d16ecb10d2c2804760d72e7bb383a0e4e9ca32c2c952669
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 10692 bytes
SHA-256: 99b32bcdad411077b26e59c1539d0220952f681ac206a5896d7d520b06e10322