Malicious PDF — malware analysis report

Static analysis result for SHA-256 56831a2dce2f1389…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 19:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 994dd1160699280f014d1d4caa0fbbcb SHA-1: 04a932165d0f9f7d5e5014aeaa49f16e6bf9ef19 SHA-256: 56831a2dce2f1389648221851c9f8f40556be41194a6f0499a1fa650e9499d3b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://ketchas.ru/uplcv?utm_term=free+periodic+table+pdf PDF link annotation
    • http://datacomsystems.cz/userfiles/file/20977450571.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/potimiwu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/regitabi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d55df98eb2---1254269673.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/fujut.pdfIn PDF document text
    • http://e-menu.hu/editor_up/82737406180.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/fikojurak.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210912225418.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/56973638975.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/jinazi.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dorefeba.pdfIn PDF document text
    • http://licausi.it/userfiles/files/napazilixodiniviluwal.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/45107123111.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29d76e76c94111c94af7ad5748895100/37195803802.pdfIn PDF document text
    • https://kimansion.com/uploads/file/24413574316.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/84616157347.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rn1kjhogscoo0osfem8v4ia9b7/bumer.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/tujebanakepenezizego.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/gogumixupemomuvivikavotep.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/63673508146.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c65b3ff9e---50141764392.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae74892d8---tatogurewugor.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/pirisogozo.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/sisapeve.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/xejowuwepidedilimijadeg.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/16093559729.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/53125924273.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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 17596 bytes
SHA-256: 4d7a09cf2faa52c9067ffe86b2c73c21b99758358eaf0a039c6d5a4468ec5c04
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10456 bytes
SHA-256: d7d64e2517d2e3e91fb9801d68a3ed901e72fac6e83570aef53dabb6a003b450
font_02_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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