Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52cf3ecf8d3f567…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 20:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78f9eb2f7dd441cf82265837392855b9 SHA-1: b76cec8f362d3df0fce434b2bb7c780fd7f44ba4 SHA-256: a52cf3ecf8d3f567224212b483b659b5fa1781e73191fe062a695da75931c976
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that the PDF is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=group+1+exam+old+question+paper
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abeeed0f622---77347145303.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db9466d0291---90552357046.pdf
    • http://sztarmedia.hu/_user/file/wupilirinuzipug.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/pejoriwalijinezelu.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/16460039657.pdf
    • http://novichiha.ru/pic/file/bidizuwigukaxobirexafed.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2bf66cbd---36201245226.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/42124400077.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90bc392d0---rulokosokitarowupozovafon.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098f337d3c87---97586934899.pdf
    • http://rainbowcaterers.in/userfiles/file/54562840436.pdf
    • http://biomisszio.hu/tmp/wagujisodinulabixibe.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081135c66361---zinunenadusap.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sndao42ko6lg5jp2ggdpq3bu55/35190803425.pdf
    • http://alexlunacoach.com/img/editor/file/5657581820.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q09piavmcqhos6gj96485oc3qs/3824750372.pdf
    • http://mitcostruttori.it/userfiles/files/pitexosubinakeri.pdf
    • https://copiso.com/userfiles/file/29523022481.pdf
    • https://iva-vietnam.com/userfiles/file/siviketominegow.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca7f1a26---55843066842.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aabdc2266---97134639122.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f55e42fc---kilafufilevonepewixeporud.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087788d3dd1d---buxagoxexew.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1biupatb308oseli5jg2k1rk64/worekabakematijowe.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bdfd2cc9495f0f13243102d695b47fcf/87030081337.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a443ab502b---nufaxiluwakiketifedaros.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e0e5b9c644402abbfffeceb38ab9fc38/78221644289.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e819.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 16792 bytes
font_01_sfnt_off0001002a.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 16092 bytes
font_02_sfnt_off00011570.bin
4464f5230eee1bdb26b09cf58c454f861c49e7021055c3f5b52499a743cf1e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 10992 bytes
font_03_sfnt_off00012ec4.bin
b937cb6ce1aa332da8610e055d1779d38dc02ce614dc565bbee0d91e1a981d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 17080 bytes

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