Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a983ccffc399c6…

MALICIOUS

PDF

112.7 KB Created: 2021-06-11 06:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 856b7dbc9273814cd7dccfc765d86ea4 SHA-1: d87a611717fe1cb40b8e248fd0a9989e56c164ee SHA-256: 88a983ccffc399c65ed8b3b5d2ff75f6097f73e1b262052b8a653c9fd2f907a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains text related to 'Amharic political books pdf', likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=amharic+political+books+pdf PDF link annotation
    • http://creptiles.dk/userfiles/file/28696831227.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kasq41arsl4c2ta7sv84iuanl5/98692651445.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vrkmpitobbet8k6ua4q9v9psml/19375604922.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ab5f22ff98c2482c2a5df6483afa38ac/34962693985.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/71945265911.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ecvigeqgnmjqf6qq08fpi9i9st/wopoxinawinowotakoli.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ufk0fmliniq4eue01b1hk4j543/fegevexolerixon.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/35590f9e630e2c831a00c17b818315ca/rigeletuwevuvovibul.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd8d00101---66378425835.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69bccf766---16704838333.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/87928380968.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f58d9e03928308ff1c4a7f2955910dba/rirosiginagogimefegeju.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077d38d6c15a---17648968442.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/073d6b1319da35060f08e70ef7edde41/gorugufujavagujajo.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/denewoduwod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 32940 bytes
SHA-256: 2619f2a65cb639fe5a536a369670df76b865161f22c1fc55b294f9973f00ee3c
font_01_sfnt_off0001631d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631D 5588 bytes
SHA-256: bb635b71fd9e1603ce9c7ebb5bf136e0668b0f6b3ccd58aff2b12087d7563267
font_02_sfnt_off000175eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175EB 11480 bytes
SHA-256: 5428838e24b651b9fa272615f7a3f504c0123080e723ab96d1cd24c4d423b38b
font_03_sfnt_off00019d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D59 16460 bytes
SHA-256: 066bee5985cf97627ae58cabbddf9ee9e32b20ed2ba34c0307524280b6b3a52a

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