Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b73b5d372898d1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 02:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1beb48ba02e77d69020cb35aa899c1f8 SHA-1: 7a5d1e9444bca390a068c17c7b1bb874ac96b4a9 SHA-256: 59b73b5d372898d1ceed8d00933de3f9683cfa7de85563281a937b6898a40d3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing secondary payloads. The structure suggests it's a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=pokemon+emerald+randomizer+gba
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16135280f240cc---tajumejezodavobe.pdf
    • https://securitydm.com/slicice/file/93408458775.pdf
    • http://premiumcsp.com/uploads/files/kujape.pdf
    • http://gojjang.com/uploads/files/lamefibinusop.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/91601924131.pdf
    • http://abwingsjanaf.com/uploads/files/65130984074.pdf
    • http://iuoooo.com/filespath/files/20210917210541.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/92962312757.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/nerexenofebu.pdf
    • http://architettogherardi.eu/userfiles/files/xiwezikisofiw.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/57848689243.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1baefd93819c4503eb3cd655415f24e8/nalawesuwuduzikub.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/3040336868.pdf
    • http://floramarble.com/uploads/kazat.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161420a4a79753---29958700428.pdf
    • https://ms2gacor.com/contents/files/zexeremabolano.pdf
    • http://www.moyekolodin.com/files/tomojagolewade.pdf
    • https://kermoulin.com/userfiles/file/nevegowarorosanulavele.pdf
    • http://agierresrl.it/userfiles/files/ligowazivitatidapebenoxem.pdf
    • https://suma.ca/upload/editor/file/17600965480.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/danusenifuwojes.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/xunipezasitovidon.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_off0000d4d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 16792 bytes
font_01_sfnt_off0000ecef.bin
91fa670747ea59464afd6dc5de2b7f96c52a416276b5fdb6e12e64438bcafab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 10620 bytes
font_02_sfnt_off000104e8.bin
21e7442828cecfa83cd9b858879a8ee433f14b8213dca3cd834231728ae83319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 18736 bytes

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