Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0ad8ecba0ca6bc…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 04:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ca0daf813651146e1bd57db84677fb SHA-1: 51c57330354f9c18c7e3f199a16640445c9f77bf SHA-256: 9d0ad8ecba0ca6bc0efdf413c9aa4390dedc71aa8ccddfa7aa57c785a43d6ba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=earthworm+live+in
    • https://geneticapanama.com/userfiles/file/xerese.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b761b38ea67---97796206974.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/99f28916bf856b1a34b749995f8699c5/78489741781.pdf
    • http://driver-jazda.pl/upload/file/nudikud.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/empjpbe1k27dhsq26t04b43ps1/38480094226.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0e47e98a---8098654413.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16098766336e8e---2347134859.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/26203320717.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e96669ffc975041f98479894929002af/nozapifatagusumeb.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pga87blkqr0e526bjqke0e3ie7/63927319058.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b81f299c---92646471977.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46318482424.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160732b09cf759---lujojapizepogiwumafenoz.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d4faadbfd05a3bf48b75bbdb68fc8138/6679160966.pdf
    • http://apsara.ru/userfiles/file/zuzajelibitutezav.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/o2an6n1a6fg4s575ujbjg785s0/gusinekenoluw.pdf
    • http://usmleworkout.com/files/file/vadofijewixifebilox.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/48krgrn0de1qbilrcsj8l5edg7/puxomipe.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec1904da1---6967166265.pdf
    • http://provia-events.de/pics/fotos/1/file/fekazaganetoroxosuvavu.pdf
    • http://bycongroup.com/UserFiles/file/xuvevisupukojelivap.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3smgo6ph3a1bu3gqsag9b2d2k3/94290738004.pdf
    • https://happycolaborativo.com/uploads/files/bekasoruvubojas.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/20502615933.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc5a08df6---rekides.pdf
    • https://al-farh-iq.com/upload/userfiles/file/jejomegujozorejubulo.pdf
    • http://aftckwt.com/uploads/file/56287737236.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_off0000f681.bin
4a771ad50aabc2093060a866b96a584ecdff258fb53b28730f54261812f25d33
pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17024 bytes
font_01_sfnt_off000122af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
font_02_sfnt_off00013ac6.bin
9223b7b41cc6527f2fc0b7d568fa4d0d0238306a38e4afa1ffdf510e4d94328d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 10340 bytes