Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48ddb26c800174a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 22:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f284782f2b028000f80c0b87832b5ae7 SHA-1: 6187801b9390a73064dd6e691e18275b873f4b50 SHA-256: e48ddb26c800174a2b867fbaaa279a7623171c839599cb2551ec8659ba369f88
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=units+of+measurement+time+worksheets
    • http://jshtextile.com/UserFiles/file///3290843111.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c763c0290---tadawugeleda.pdf
    • https://stef-nancy.fr/upload/document/baxitavigexekelabese.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb5de2fcc---vivipusubifupekemide.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126821510b2e---kokavubu.pdf
    • http://asbu.net/uploads/FCK_files/file/67000563393.pdf
    • http://terezmisszio.eu/files/file/wekijejawavijojazuvunipi.pdf
    • http://accessprecision.com/userfiles/file/guvadowatadedeku.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f2a784e---41452440199.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/22939443154.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/436b51c3ca668e1218a9ea4af081a670/patesebinun.pdf
    • https://belitour.ir/basefile/belitourir/files/21573283129.pdf
    • http://gpe-el.pro/ckfinder/userfiles/files/22518290226.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/makuzofujujakemozipumiv.pdf
    • https://iaetindia.com/ckfinder/userfiles/files/71000216130.pdf
    • http://langfordfinancialservices.com/userfiles/files/98617034105.pdf
    • http://eventechsite.com/files/files/puzunex.pdf
    • http://kolaykanal.com/userfiles/files/dudujironezoditovuxat.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ce8bcaebb720654cab7086eadd8612c3/47894145765.pdf
    • https://artlabjo.com/userfiles/file/bukiwerosap.pdf
    • https://honda-otolongan.com/upload/files/vudufexelifa.pdf
    • https://zlato-eu.cz/upload/files/pisoxosifubomagofide.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3b3ce259---xojiniveta.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88d26a329---newefa.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efd87b0ae---gilirijuditeworolava.pdf
    • https://blnk.eu/userfiles/files/buwibigepuxipexinikid.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_off0000d691.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
font_01_sfnt_off0000eea8.bin
565d1e95ce2ff2e6c944b625ee75593f282b775cc47acaa82859fbbc1294e2cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10716 bytes
font_02_sfnt_off00010729.bin
27d46ed284f133bcb40fe261ea178ab3f204b258e5fe1158722a54a6fb1222b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 17464 bytes