Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd63927aef4deb5…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 22:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd1fe0efa0dbd67e3e76335dfcc04760 SHA-1: ae8d81d80f5b4ecbd4c2e0de195c52169ecc13b2 SHA-256: 0bd63927aef4deb5315f85b076e2e63d49ced08e2e176177f2d79db8703134f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. The document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d30e78b56ee6573bdc16c2bfedbbf56a/fepofasurukokiwagojunuj.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2d23bb70---15942731389.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nepuo91aqp2r6dqrqma8g0ch3s/55541164505.pdf
    • http://maxbrio.kr/files/files/69421281315.pdf
    • http://aircond.md/upload_fck/file/sosogumoke.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/432a0bf971ffab1caf4260d4d0929cd5/modis.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/anpuvl15rj0gp8s1fbn9nklhk8/23647317032.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/96220943659.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b18985924c03c557560bf6c7031bb6ea/88686445733.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe68158bcc---tixodalixibesisixiger.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/wisipiwedofopibefa.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500096bac4---35955722415.pdf
    • http://adaviestransportltd.com/userfiles/file/18904998547.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/nupuxabevedezon.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24fdeb989---lurixisenunilezejig.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aca16e5300f---1210170035.pdf
    • http://kursadowicz.pl/Upload/file/97417022274.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a734d77eca6---36439576342.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8163666b9695393aefb8f3bc978eabee/visamolojip.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608006dec746a---netowuposufolajifolu.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f19966e96---ruzebusulanoluvafusinode.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d69a8518f8606c5fa1d1a3063b5e2341/wugulunujedisoto.pdf
    • https://healthmatters.me/userfiles/file/lulenis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hr+jobs+for+freshers
    • 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_off0000f850.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16792 bytes
font_01_sfnt_off00011067.bin
8c6862995ea1676ea26ef53f80f92100fcb5c9aece97d1929f7114d15f6e2474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 10068 bytes
font_02_sfnt_off000126e5.bin
7f97a1aa633bc8d43ca9287a3fdc24a4d4b5ad470e3d066641f94de83611dd7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 18124 bytes

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