Malicious PDF — malware analysis report

Static analysis result for SHA-256 8186440371e04ff2…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 05:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6ea0664c4d2c46511cf056f7185c145 SHA-1: 8ccd040dc54445ecb9445c166591f054085c955b SHA-256: 8186440371e04ff2f604b2c197948c50e779845cc654982eb4a6f984ee40e1ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=we+should+use+reusable+water+bottles
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070942577b95---pejude.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d73d62c4b---vejavaponoleweso.pdf
    • http://yongqingtech.com/d/files/85501499100.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/387775604bf08a09797dbe6c41dc1d93/depaweboxoju.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/p3t9uktc45cgiir058fqr6rgek/wixurewodime.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/afa8b56c74b2a0141d4def0a6c0bc45a/babufiw.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c35117094e652b4aee9e1f13f2da0a9c/mewatavawudare.pdf
    • http://olympusflights.com/files/files/sebulezezubonopojijajetup.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e1e593c2e2f0a60dc44184a7784b9cf5/visivumakadoruxowen.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980858936ed---supibunotulejoxif.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609919336c22e---makerur.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083279cf370a---polebejosaf.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ea9197e58---22917038508.pdf
    • http://esoftland.com/userfiles/file/77464741193.pdf
    • http://batiment-tunisie.com/userfiles/file/11625457770.pdf
    • http://sun-tes.ru/files/file/pisik.pdf
    • http://auto-spec.ca/fck/file/65004234761.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/shr3e4vli46csvb8i4b5sua6q7/dilufogufa.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ipqdumo1k653stsvsvuh6ru9a6/simivokopukidujuxanilemer.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d63d85f11c9d9268dd6435686b46bbb5/46559653340.pdf
    • https://bookatowncar.com/userfiles/file/rudalamagogavipafude.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f16e17e7---sobidolizusoxonedujidoge.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f7cc0fec---dutapekuvokakapi.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f0162a68---33941264851.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abee41c9b5a---katuwerufesasufinili.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6c7b02a3---rugimedagapepipomalawep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 16792 bytes
font_01_sfnt_off00012011.bin
760064654ae265419a871f35b7894623e24b26d23aff6bb28fce80ce5387e00a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 10468 bytes
font_02_sfnt_off00013816.bin
a7beac0aa072f32735be1626a769007367b705f00bbfc54864bddfd98b089b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 17872 bytes