Malicious PDF — malware analysis report

Static analysis result for SHA-256 5001d56e8fe71410…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 567a3e6f4029218c4005c7278c08efe4 SHA-1: 3e9d7446d4044c8bb35fedc7e6258435a491fa4a SHA-256: 5001d56e8fe71410341be706e7ba1d0d8ffba64f99b8b37260786ebeda6d3805
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm' heuristic suggests the document's primary purpose is to redirect users through a series of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=hexaware+aptitude+questions+and+answers+pdf PDF link annotation
    • https://bi-kiesabbau.de/cmsimple/images/file/84708784403.pdfIn PDF document text
    • http://meta-min.com/files/wizidotegegemavekavupu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fccc6c05c---5498323242.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7b8ca291---zafeti.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/36724955115.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/19952881674.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/fepuxeda.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/nitelugafugavuxeda.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/7344800872.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a9c5d2df8608c21b543835439638f150/wedojawavabakige.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/xujemaxojunulopalajuf.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/durenu.pdfIn PDF document text
    • https://shevian.com/images/file/mererobukenotux.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/47139045124.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/61858376663.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7979a86b8263be5afef465658f0fcc0f/xajiwilolufebukisajugu.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nuboxefanebozideve.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gajuroxurexusirivuxuwi.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/bitasigogapo.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/megisujepoxexo.pdfIn PDF document text
    • http://momsystem.ru/public/file/20535912247.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dupiwivudijolenalufefe.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/80384881385.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/37874774601.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/73445326738.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 17412 bytes
SHA-256: 3e41bdc5aaaf4441dd57053adf88c0ea193a8ff3a280db6d13590ba23649506b
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10872 bytes
SHA-256: bac4abf2c3ec95f7b33cbfa88d158360692c9cfd278dac08c524d3df298feed3
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1