Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba970bacf3ca076b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 09:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 969277cf00a968f95036caaee88052f3 SHA-1: e51b7a33a782ad9af6e8550b6bc92daea3822ff0 SHA-256: ba970bacf3ca076b3e3ce0590c9183ed4b038a3d712fbd183899b65e386b5dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=minecraft+multiplayer+cheats
    • http://myphamnanyno.com/luutru/files/13799306892.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/92408348253.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/77646698885.pdf
    • http://flyingwedge.com/uploads/assets/file/xevudabifotap.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1728c598---65317620778.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/mogesopadax.pdf
    • https://coevent.ru/upload/files/16406091940.pdf
    • http://sangjeom.com/userfiles/file///wenopeb.pdf
    • http://pastoret.it/userfiles/files/xidabuv.pdf
    • http://www.mab-solutions.fr/upload/file/91338984036.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa831b61---63705184494.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/fepufunumaxomaposire.pdf
    • http://hightopeducation.com/cms_uploaded/file/26828271501.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/83634345584.pdf
    • http://aquaclub.hu/userfiles/file/25835353259.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe53774c9c---lupijirekisugise.pdf
    • http://architettoseneca.com/userfiles/files/sovuvi.pdf
    • http://chiaranannini.com/userfiles/files/97485005251.pdf
    • http://quaisetoiles.fr/img_pages/file/41511656302.pdf
    • http://fishtech.org/uploads/userfiles/file/file/93141257654.pdf
    • https://martabaktelor.com/contents/files/kobojagojunolefimotero.pdf
    • http://gespk.com/userfiles/file/kirija.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/69021937826.pdf
    • http://omegapizza.net/uploads/files/jijariponu.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_off0000d95e.bin
f594de30cd7d572b917207a9aba2530b984f6296020afb263c6ecff246fa680e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10832 bytes
font_01_sfnt_off0000f22e.bin
c9e70c5e320466b0b87fe61f824139bb7dc797a886e8b39ceac7c74b3fedd8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 17048 bytes
font_02_sfnt_off00011e35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 16792 bytes

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