Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8fde788304cb7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-21 06:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd6056f6a4a5ca74aafea8db75e3867b SHA-1: 4be399800b33295c6a4f33ee3f338b601dcb7c4d SHA-256: 13d8fde788304cb761d2d1fc0ed1b4445a0081e69184b5a7d1f31f20e7e99c1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/fe03f9a978f4c97411f8d655136079a5/35787558733.pdf
    • http://zabradli-znerezu.cz/userfiles/file/11195886928.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/672f9f6da27f43fff51b45aabf93f7cc/77409710388.pdf
    • https://getadoc.in/ckfinder/userfiles/files/88877462221.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f732bc2c5---sutokigu.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pl1mc7t9us4hduenqlmotbcgph/2159656822.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f55a00632a43185dee5025fb9500505/57822009910.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0c228aab9cdeebd380c8f45041c8718f/96319562172.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/kobara.pdf
    • https://vialivonica.eu/userfiles/files/72407810438.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82748b0edd---77364311690.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/56306422267.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a1e95990---83041868192.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609a365f9c185---bixeje.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/57984066859.pdf
    • https://hamasataccessories.com/userfiles/files/84753178497.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9f049b9df72f1f399c59385a1e4aaa15/95343129183.pdf
    • http://doremimarlikinsaat.com/userfiles/file/41326981150.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a777454323f58bb5be38fb80fa564d36/jozasoluwemoxavarode.pdf
    • http://musclecar-taps.com/js/upload/files/67574406029.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/08c4ca544aca39c90cab3b8e9d6e3f99/mazosozujamem.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718da84e8df---10099345356.pdf
    • http://www.bash.cl/media/file/poweg.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608584e58973f---fezatuwovexoxibudesom.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160750bc0c4e4a---gigilivodosezo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pink+orchid+betta
    • 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_off00010539.bin
ee0a75f16354cfecfbbe21b91903c197fdb02e1fe812b3fe348e34c2bd2a7371
pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 17200 bytes
font_01_sfnt_off000131a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16792 bytes
font_02_sfnt_off000149b9.bin
db0e4e0a39842e253846aee5af51ae08da4900dd08e84b7212ee93e2e8826c1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x149B9 10484 bytes