Malicious PDF — malware analysis report

Static analysis result for SHA-256 08318e7c4fa0d0ff…

MALICIOUS

PDF

78.4 KB Created: 2021-07-27 15:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faf0db712b90d7bc70b71fbb062f112a SHA-1: cf1d647ead0bc3c7a0f047eff4b522412a94b936 SHA-256: 08318e7c4fa0d0ff4a6ba64c33d17292f667ab3aff1fd6cb387e62cbd5110691
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, with some links hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://big-blue-bus.com/pics/fotos/1/file/moromoxulud.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0fd95ef97d895636055ab274e2403639/67477229033.pdf
    • http://tipsclubcr.com/campannas/file/juwosuxif.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/38d1d80f29379b71e1f69f87f33d5999/mogusuzimisibumitoxudozoj.pdf
    • http://morard-mcf.fr/data/Files/56209427110.pdf
    • https://dm288.rs/slicice/file/siwewaduzawugisifoxa.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ce67c3e11---38323694603.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f1khao0gko9gbe5l10k3luhqvp/boxok.pdf
    • http://commune-bourre.com/userfiles/file/wufejirepukojugulazutiv.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609962bf17a65---86064545127.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90337724a4---16203021916.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/95c7ad96d9d49ac07b88bc6a4d8e4e36/96633612173.pdf
    • http://dailitara.lt/bites/uploads/file/9810747329.pdf
    • http://drlalashow.com/php/billboard/uploads/file/38542349759.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d9aee4f8d---3557009901.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e343c98309---45858531134.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e28685611ad---mufurinupejegobogabovi.pdf
    • https://karinbentum.nl/uploads/file/53697787391.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/30954076946.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6147caebf56054ba1a3f7cf9bb47724e/nilabewute.pdf
    • https://doluhosting.com/calisma2/files/uploads/41017167798.pdf
    • http://ash-graphy.com/userfiles/file/38425115629.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=youtube+to+mp3+free+software+mac
    • 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_off0000cfa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 16792 bytes
font_01_sfnt_off0000e7b8.bin
9d0249e2ba6dc41ea3600c31d488d93368c60a32ef75cb5df98da9f4d671c48f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10880 bytes
font_02_sfnt_off000100d6.bin
fab673c4a9a51d49ca5882632850ce47ed8d66f42b33e8eb754cb3dbbae72f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16520 bytes