Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9fc4778b10f3a8…

MALICIOUS

PDF

100.2 KB Created: 2021-07-25 23:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29d44f9fb93c70d89187878b942edb6a SHA-1: 058c4d7909e01aa87486ad3bdf31e8dce6ada7cf SHA-256: 5c9fc4778b10f3a83bd07fca4374875e4376a473829f52d56761ac75b578b3f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine rankings or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cardion.dk/gfx/fckimages/file/fetavesabiteset.pdf
    • http://cavusofis.com/images_upload/files/79702576484.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/j21tutfrj57j19u0cbgiivg3fp/nekosapodoso.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aab385b2af0---xidufugur.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb6e0671f6---zulesudoxituguxe.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/r5ai2fvmf79csj8281cgecmrva/77539727202.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087159c4340d---fumuxobo.pdf
    • https://hobbes-group.com/upload/files/doponigojekekopejizesilum.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/de160ac8d55bf732c24ce60d912524b8/98095823340.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d3fd4d6c---76107818045.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/68923404287.pdf
    • https://cargobull.cz/res/file/91762441879.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/20317992124.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608460bced235---tasetakukexitonavof.pdf
    • https://angkaganjil.com/contents//files/52507911637.pdf
    • http://bogelaipigeon.com/upload/file/65734718791.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sjmg801vtv9p8n8m1pcch8fcsv/ximisuvedajajafixozibol.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f637d73d6---magikanazegifibopu.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/153343d2044f6149599309fd06821155/fekunijopekaluwukelunanen.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e67878378---zumidutomamemobar.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bc1d8d87fe0e770b6c183cb6aa6fd303/napoperajodavorilominixo.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/028af9f0726d85bfd1cd8651ebde7a7c/napedojikoje.pdf
    • https://plentis.eu/ckfinder/userfiles/files/vimakufulapawo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=o+que+%C3%A9+raiz+da+equa%C3%A7%C3%A3o
    • 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_off00011567.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 16792 bytes
font_01_sfnt_off00012d79.bin
3175470516538053d1505130307ce7e18bd3b3852e81d1788527853708ba9143
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 23200 bytes
font_02_sfnt_off000168ee.bin
6c7a10d6a68ea45838468bd43daa7e01eec23e6ce0c1c2c118e9e202a53641fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x168EE 10772 bytes