Malicious PDF — malware analysis report

Static analysis result for SHA-256 70783a0f72861b36…

MALICIOUS

PDF

91.1 KB Created: 2021-06-25 17:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2284c306a1fe70a861727e7e5599c206 SHA-1: eecf615c6c45830689142fe8902c6abfb64baa08 SHA-256: 70783a0f72861b3659b964f865d1a8d4f217931b075fd1572d26133511e44d26
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely functioning as a link farm. It contains numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content or engage in SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890c4121052---77561502999.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/n66bsv6rk9armt4hsalfiiptl0/buditalupixik.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb0155853---12132878371.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/70mlhk6foc3dbr9sobvldhcpsj/31196460485.pdf
    • https://ph2020.org/FCKeditor/file/lejerizi.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90943b604---87895793481.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/ca82696ea4bc0a951a7832b079d5968a/98172049834.pdf
    • https://swift-tw.com/lcc/upload/files/59474478636.pdf
    • http://boeschfamilytravels.com/clients/43210/File/mogipizimifijitodavok.pdf
    • https://artbynela.com/uploads/file/10639602297.pdf
    • https://mangonebike.com/uploads/file/vaxigaguzojavafiwuzut.pdf
    • http://elementsgogreen.com/userfiles/file/tudesuduluwobipufuxalisa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oba9cn23h33essoh3egrsjeqk0/koninezunaguziduwal.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/470c734a26858d047723da8560efbd18/rogevarakanige.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3b46bb80---90465163474.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/db2d40e7c1c025f440bd2e6df03c48e3/642358815.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2c56i8fot40bl963g23pv2rblh/zaluvukaviwon.pdf
    • https://radmangroup-ye.com/rgfiles/file/miriru.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/72975711876.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b2740899e9f36f5026102286a5645910/ruzadipixeliporokemig.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/repemewagorez.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9847f461f293268d96efd02608bd4ceb/31392666437.pdf
    • https://publicbridge.pl/userfiles/file/rujuduledemobob.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838f51949d---gesusovinezod.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a4896d37---pifuwuxofiwobopugenama.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=invercargill+to+oban
    • 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_off0001020b.bin
08721804bcabc42f7d72cb7003546f8441579eaf9ce863f9ea38314e0a37ed15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 17348 bytes
font_01_sfnt_off00012f75.bin
62551874ce57f5b2e20cd45aeffb6b5d3e49fdb2a9fb5fb79a3e38c5b5e3b01b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 10392 bytes
font_02_sfnt_off0001471c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1471C 16792 bytes