Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d66ae5f53ebd14…

MALICIOUS

PDF

119.8 KB Created: 2021-06-30 22:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8a3f2281079621f2a735ff2f7e5cc77 SHA-1: a93bfd556d339c802733465d895ebc0fb280c9aa SHA-256: d9d66ae5f53ebd14f3481dee0fddf58370d8814fe04d45b0cd693962a8af5fa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cb58d87b3bfc02fcc08690ae8d264c26/regerokomomadenekotejo.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a57aec34---siwerewirowazezazab.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/095888001af53351e6599cf0090a0b2f/6847397292.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ad802d61---64701685591.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6ab48c07---tariwilafepuxetitonim.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608748639817e---duzonuzedejomivorafudiv.pdf
    • https://starbox.fr/img/files/18961714140.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/aeaccf728f7b46716f0fd91c60cc84f0/komevifabuvabamupu.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fc3af1f94c703f5584ea3cb35b599adf/46618117132.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2883a0226c750d27d90fe7c06a0c45fb/33791220147.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2be6c32a---gufedufuwomezum.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/fefegukin.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/562f5c3b1879dae6a188a8629f0f74c1/wuvinojo.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jpu2dj7mqnfkvrruf2shh8lnr3/purerodeboxinegage.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346a9c7ce---popudexijesasod.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/wefinumogesodil.pdf
    • http://ccspatti.org/userfiles/file/xesigawakifepizipodiw.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e4b2dbfb864b7d42a87bfdd4e6124b7c/viwageruxoj.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d6136f0d22f7713fbfd654b1d2118a84/36198070937.pdf
    • http://mwflower.com/upimagesfile///57021479078.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/lizim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dog+in+nightmare+before+christmas+name
    • 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_off00017375.bin
cc8326fdd169689412eef3fec2e53ce412b89dbbe0f1a51e39246747f907dc1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x17375 17812 bytes
font_01_sfnt_off0001a128.bin
07d3323ca7dc3f44b5dd33e14edc3f5a034a8a81a91694fc192e2aaf1356342e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A128 10876 bytes
font_02_sfnt_off0001ba15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA15 16792 bytes