Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c93863ec47dcc19…

MALICIOUS

PDF

84.6 KB Created: 2021-07-28 02:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c41c22e442397179360877242091b76e SHA-1: c40d4fe25290c8765a166ee628095edbd9202e4d SHA-256: 1c93863ec47dcc190ba73a6481e78325c2ac8922b856345e4f73a1f53c73ce7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to manipulate search engine results or direct users to malicious sites. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further confirms its malicious nature, suggesting a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68a35879ec---62106112928.pdf In PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kagujugusurivemizem.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/jitibidukenomolu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f14a0fd2---75851232516.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/rixisonelapox.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/7682147633.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab14092b2a3---vonugesadidasejige.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/69236688704.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f664bd0316---22542288932.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/33d0b828903236911bdaa4f2f92a5640/74304544677.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/ronedot.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kowurujagux.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/69999892110.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8b67f895a500eb10132d89216ebfa4c1/nevegefatoxukituvovame.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/53628170624.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/63364398922.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761695dc56d---53349817888.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/95302407400.pdfIn PDF document text
    • http://rayer.cn/d/files/vududatewolamaden.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609177d0d1f13---liriroxunukelize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fundamentals+of+human+resource+management+8th+edition+apa+citationPDF 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_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 17180 bytes
SHA-256: f9387aba625df44b765ced333423e02c5d29e81107bc14863df3302bd60db09b
font_01_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 11352 bytes
SHA-256: ad0f2ca69b7a9d1edceae79ffed059770f2c3a5e6154aa9a0e5380615633af2c
font_02_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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