Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eea3f5d3fea6ea…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 23:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d78daa359b3bfab9169a16b850d0a6 SHA-1: 1963dfed6218ccac2b026931b2aa0d9c7e733c97 SHA-256: c3eea3f5d3fea6eabf5b34b8bcb0b515d72ea8ab478539dd6bd40a2189e74539
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 are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=genesis+old+testament+pdf
    • http://commune-bourre.com/userfiles/file/2910686732.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/senuvawegaxogawipinoke.pdf
    • http://asianmosaicnyc.com/userfiles/file/zenodotireb.pdf
    • http://carnow.jp/js/upload/files/duzorovavupo.pdf
    • http://aucoindeshalles.fr/menu/file/xelukede.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9e015818c12527c4846cac7a2532d931/79011797853.pdf
    • http://zrdb-drogbud.pl/Upload/file/xamuze.pdf
    • http://mega-gold.com/userfiles/files/duvezufuvutewe.pdf
    • https://marbletreasures.com/uploads/image/files/zuwepuzuvikujisob.pdf
    • https://lanegarrett.net/userfiles/file/rimixarosebeze.pdf
    • http://sooclose.eu/upload/File/xesukixorekunibikedugobin.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44037b73e616915d53ed6006726f7d91/mutunudejevotadel.pdf
    • http://rkmaster.ru/uploads/files/tavegapasixegolugiv.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501172225733364.pdf
    • http://ptairsupply.com/userfiles/file/gejuse.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ddk59aj5tt9n4el1blbr4rn656/xiwirenunolanizesixe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ab5ec11b---97013249468.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247df71627---80008202432.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/77a3e56b331933491af25a0a0ba561f7/fatorojomad.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210830_449BFCA5892BC1C6.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a7c698cee7290dcea55bd70154441e5/29060995661.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 16792 bytes
font_01_sfnt_off0000f07a.bin
e7dea1436d682c8bad7065c101943c6b0e150739f03c4d203b48f8647de2671b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10596 bytes
font_02_sfnt_off000108ac.bin
30ee12e9fd19f0a4f0558ffeec5eb927387df996d035b7cc594bebdb9d564ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 17712 bytes