Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b1d178374a3327…

MALICIOUS

PDF

87.3 KB Created: 2021-07-15 23:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 254799332b200c7438fa0d9b11766693 SHA-1: 949655dd50e0823e38e5ab85a2ca94b4f65d273e SHA-256: 64b1d178374a33278bfb09a55ffe66bfa0c588f8ce8928a81c8b237399ee5647
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cambridgekapurthala.com/damana/userfiles/file/nodageserizele.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf739c30f---13340872326.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210702_64EA914786B44B04.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160812c8ad66a9---kunipixoxopelikujedo.pdf
    • https://rocksoliddesigns.biz/userfiles/file/sojiwoxavapotegur.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608011618cd77---120650846.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4441b9f21f---bazuzukaxirobosesovug.pdf
    • http://www.ecvbrass.ch/user/web/file/88641131285.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79c3a4cdd---pozuvobutubitisorolevo.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a517490c---mefifukemorovazufagi.pdf
    • http://xpressup.com/userfiles/file/68945307270.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/de03e346a00aa40de5b26ab013a15c75/vigakakekuzuwakaxe.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/rozewaxu.pdf
    • http://studiospazioambiente.it/userfiles/files/69606483654.pdf
    • http://debschoen.com/userfiles/file/42054304419.pdf
    • https://deltagroup.bg/uploads/file/57630108562.pdf
    • http://busanpc1.com/upload/fckeditor/file/vetejen.pdf
    • http://hb1004.com/userData/board/file/dagarilirunika.pdf
    • https://avgdesign.com/userfiles/file/66228900711.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tmbjh8j3kfv3ha5k8bpotijh4d/gumisadad.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1b52b3fe---6545495636.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/69971518286.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b71c2d1dd---gopagipimuzomegefitanobe.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f4456bac---50158554986.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=security+clearance+reinvestigation
    • 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_off0000f4e9.bin
a66fb3e9f2e28f6fa90128ad9c4382469e07cd4f2ac293314d280f64aaf02dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 10760 bytes
font_01_sfnt_off00010dd2.bin
07799cc3a82ac395bcfa8f975ae1b5d1c1f9320f43034929eb5109f77d72ac95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16424 bytes
font_02_sfnt_off00013804.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 16792 bytes