Malicious PDF — malware analysis report

Static analysis result for SHA-256 784e5fe90da38372…

MALICIOUS

PDF

79.3 KB Created: 2021-08-03 14:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a185560067d73ea82090162d2c78de1d SHA-1: aecea482285821b697431c68c03f61c9695df91b SHA-256: 784e5fe90da383725319db5f108912374850fd8c74a4087f686755578905bf03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple external URIs and the link farm heuristic suggest an attempt to distribute malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://air-ned.com/uploads/files/72298809443.pdf
    • http://gillsandgeckos.com/userfiles/file/95690736511.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/49bd8666237f3c4c9ad0631864f32bd2/25123944869.pdf
    • https://roc.mn/uploads/files/nubileditozopazuxovusar.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/sowujubamejive.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606caee7ec58b---17968085963.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/dotojuzupojex.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2176e174c42b78f7f92f290330f75055/wexilegun.pdf
    • http://jakpaisanestate.com/images/upload/files/97582417485.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe4a75876---wurijosirivege.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgkc891geoisjpmcr65l8g8f27/bavonaz.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c406af7dbb4---27378750437.pdf
    • http://519pf.com/userfiles/files/4707543514.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/471c4bb9ed9a42cd4ce84a258e6fc57b/8831450241.pdf
    • https://aradovan.com/userfiles/file/75298357883.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bb1fe931ced9c62eb236acaf831f3bbd/xepavekawalijujekugox.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eb148a1e---rofisisibirobikagu.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083784ebf3b6---61289049966.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6500c62bfd---5354465629.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e463bbd7cabd0a68d8b30c7fd1f5ffe2/kidogoguna.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/pijugosafe.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ab25e5776331f34f3eb0a3398022243f/tobabivisalulodajumo.pdf
    • http://broorybulldogs.com/clients/33993/File/72986181089.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=where+to+buy+similac+ready+to+feed
    • 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_off0000d0b4.bin
451f3be12a833fb1834bb18990e65458a1081ac70a55a802a53c8c3eaae4f046
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 17336 bytes
font_01_sfnt_off0000fd4e.bin
61c01bc18ed3eb06d2327eecf3ff59df48e666cd784759b24a2aaa7d9c56bc1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10984 bytes
font_02_sfnt_off000116e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes