Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ac1b281fa6fcf2…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 22:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c438ac2dfbf59321feba1a078df46a6 SHA-1: df7083519ef73eb3a88d802c387f466dca695e83 SHA-256: 35ac1b281fa6fcf2e5bcced70ecedbbcb035b36a560d1b911b141cc0caf99e65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/22f5fcbe2c1ce73eb649357c7858c759/folenukeluxutotonot.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090660a50e06---ralumoboxunoju.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/27482739800.pdf
    • http://amdind.com/userfiles/file/repobisezipo.pdf
    • http://aep-tc.com/cache/fck_files/file/75255725903.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528160343.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e776385b9b63c54c7000aecb0614c1d9/gakezevodusituvisotilorod.pdf
    • https://alexandrapanayotou.com/web/images/static/file/27722915966.pdf
    • http://fructusartis.com/i/File/36292240687.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lrdqch3emcjalqf13b337oi7ub/89577649057.pdf
    • http://kleinschaden.expert/userfiles/file/57646330876.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/a59f71bab956fbf0ee5e2e593ed142df/90543103572.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c09d3f06---12887605112.pdf
    • http://mesahighclassof63.com/clients/79820/File/vikerefuxi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b7cbbace---xujewebuvekomagofaguwud.pdf
    • http://kubabus.cz/novy-web/upload/file/1725922488.pdf
    • https://ms01bet.net/contents//files/93534418680.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a780649d45a---fedevamo.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/o05s1sq4csghp1it3gtkgjabiv/52645377837.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/17881093555.pdf
    • https://ksboutlet.com/file/files/vipularelurupamegatafab.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083175bdd5b6---fokavebibowo.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f7833ec6---88245860429.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=who+is+monica+dating
    • 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_off0000f562.bin
d9016dd09b5fe522b838824fa8e504d71467d4743b884fbed2a95ec8b29071da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10532 bytes
font_01_sfnt_off00010d07.bin
85132c5b28e435178a8ef825ab669511df0eebbfef9b329bf8e9ab2c35b1e23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16768 bytes
font_02_sfnt_off000138a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 16792 bytes