Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e4c0e1d5dbb5e3…

MALICIOUS

PDF

62.9 KB Created: 2021-06-06 08:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03917c60eb36e4945f2bcea86bb1c897 SHA-1: 7cef635345603de78d353e5a7c473b4837696f56 SHA-256: 63e4c0e1d5dbb5e35ee79562682eaab93503e0436b1eed9a4982c7c1362a1fa8
154 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to compromised WordPress sites and link farms, suggesting an attempt to redirect users to malicious content or downloads. The document body, though partially corrupted, contains keywords related to study materials, indicating a social engineering pretext. No scripts were extracted, but the extensive use of external links and compromised hosting points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8467

Heuristics 5

  • 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
  • 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=acca+ifrs+diploma+study+material+free+download+2021+pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca178f3c6---27322240158.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608db12353410---luwegelukatomozoxuto.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb10fec2ad8---49953486631.pdf
    • http://peneleos.pl/userfiles/file/43342747865.pdf
    • https://alexandrapanayotou.com/web/images/static/file/zizawojeleja.pdf
    • http://aelma.com/sites/default/userfiles/file/nadujagewokibap.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5f9056a2---wexanivipulapek.pdf
    • http://100gastro.cz/soubory/files/48791482282.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868db4e2cb9---gotadeperegudowobo.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0qsgkgpala17gg3eh6jcuclup5/12351371012.pdf
    • http://whalesart.com/uploadfile/file/%5C/2021051806273635.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1c39bb0607bee2747b7950586dd6ff81/lirawigixodawerozulanami.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31a51844d---figejawafe.pdf
    • http://haniltm.kr/upfiles/editor/files/biguribeliro.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/19494657876eb188cb6222d7a70e57aa/bewelenekatoma.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608994a27ea49---xibizofumasawi.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6bvvl43tcghqhesghfl0055f6j/8433861414.pdf
    • https://alamansyria.com/userfiles/file/77830695513.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/56jn0t80cugmvkcs1gvb26rfi6/wofiluxomovujazavokufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd2.bin
68526c6b3e1a34d5cad56db0713d1d971f2f24c3685f871485794c8ff037c95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 5812 bytes

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