Malicious PDF — malware analysis report

Static analysis result for SHA-256 d100727fcaaa0a0b…

MALICIOUS

PDF

90.3 KB Created: 2021-08-15 07:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c51d9ac4852d39c43e10887ec26bba2 SHA-1: b16aead6d7e2bf06dc4fcb919abf5fbfd6d71412 SHA-256: d100727fcaaa0a0bcdd90403e3e74fdb0dcbc50ae33af7f76723e0bedb5d558d
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. The heuristics indicate the PDF functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. This suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://dzwigipoznan.pl/userfiles/file/sapewak.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68958525468.pdf
    • http://www.herbertvanderbrugghen.nl/draft/30039555392.pdf
    • http://jp-photo.cz/soubory/files/mejabumivokolugafovomowi.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081f30382ea3---39433201426.pdf
    • http://noithatphathuy.com/Images_upload/files/71011958277.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/veloxoku.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100790c00498---xudefigiwuxixepuve.pdf
    • http://www.examnotice.in/uploads/files/revejojinoxupodakuka.pdf
    • http://campingwithconvenience.com/files/files/39571052328.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/mozisibifuxasi.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1k0oafh3ae3370k0viq41ehi56/86296589413.pdf
    • http://adria-ex.com/images/blog//file/gakuxusa.pdf
    • http://tungalag.mn/userfiles/files/tarini.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/93792678740.pdf
    • http://asokmontridental.com/userfiles/file/duvakabuwagof.pdf
    • http://avonsteel.com/UserFiles/file/98965701488.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/45776754700.pdf
    • http://mezon.jp/userfiles/file/40528077873.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/72f3f403008d27523ca462aba3c793f5/polipimevedixo.pdf
    • http://www.petercar0937494634.com/upload/img/files/8559516347.pdf
    • http://universalgroupautos.com/files/others/75430129675.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95b2114d1---64796258679.pdf
    • http://abacusnancy.com/userfiles/file/tuxutusomafofiverakajijiw.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1efb3fad---79913915109.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083256637fbd---20473981084.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc162b151b35b3d0bf0190f18a3c01f9/pojokokab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pediatric+advanced+life+support+2020+guidelines
    • 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_off0000fb82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 16792 bytes
font_01_sfnt_off00011394.bin
ef2660597e0f38e1b192cf9066317cfabbf7843f0914b558da064fa3e4737bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 17192 bytes
font_02_sfnt_off000140d5.bin
c7ebdb77ca0d708dda806024d1cb65358515ec87cc7e1471e2e7acf68a6ce233
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 11204 bytes