Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c7104f3f5e702e…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 07:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c8de0f5955b0f8753bd592000c2a99 SHA-1: 7f1455ede268da75128103e5f94f263ec9670435 SHA-256: e4c7104f3f5e702efad9ac6494577bc2fcfbecca593fc9acd4c2a07558698b65
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=best+town+hall+6+base+layout
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1edd86d9---leduxatotoru.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/655feefcdaac33d703131bd6ad072f9b/39716724867.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/fda19f9178ca2cd026293bacb3596570/85977576410.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/rotagalipe.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ee8c2b86---24427880178.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607479b166849---masoredo.pdf
    • http://www.kilincsweb.hu/fileok/file/69763399684.pdf
    • https://obermeyer-modemarkt.de/upload/file/31700324112.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/df16f83762dcafe0e7bcdb6b967f9038/9394931451.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lf544pk8jq2mhk2cbkgjd6kba1/gebozetesidiniwujugirun.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f21757513---23939925513.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/78g9b37l836qtnt3oq5u3ibmh5/pasesanifugul.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/bt8n8g0tgqhejbs57c7pai5v1g/96051602427.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86252cf899---zisukusuzara.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/68dface85519632af2402fa5418a2fd8/zikaxek.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69caba97f6---18632630686.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0361be4199---lufesowoxiluwofesawutan.pdf
    • http://agcslohian.com/userfiles/file/91061875833.pdf
    • http://argyleliquidations.com/userfiles/files/sisatadasipobumesufine.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1vfs4sr9k929nao2eg4t6u75ou/wozezukukixalum.pdf
    • http://kimandyoo.com/userfiles/file/vulesa.pdf
    • http://fouladsazanco.com/Upload/file/62921192346.pdf
    • http://bpsstudio.hu/uploads/bukaxizawul.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6fc57093a76834c858432992d2ed4d45/41475816371.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_off0000e6e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16792 bytes
font_01_sfnt_off0000fef7.bin
fffcfc9a755c23cb92eef476a6d160b6f8e92a1e1d33ede57a9f5a66301349e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 19760 bytes
font_02_sfnt_off000131aa.bin
b716c59d7773ef5d55b1b6319e5e5ffdd0c393930b47a97917b8eefab816392d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 10676 bytes

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