Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7a8336cc899cfc…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 18:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e826a1f219d3a475d954f001cb8bdfe SHA-1: 558f33ebdcd6ee2c816b36cf70fb30307fcea6f9 SHA-256: cb7a8336cc899cfc74bf2580faedd3607b128aa4a3f9a23927e318b22698c399
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote support tool. Numerous embedded URLs point to disposable hosting and compromised CMS uploads, suggesting a distribution mechanism for malicious payloads or phishing sites. No scripts were extracted, but the PDF structure and embedded URLs imply an attempt to trick users into executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://crewmak.ru/uplcv?utm_term=out+of+scope+in+project+management
    • http://hgbs.de/userfiles/file/jobijuroxikizakufezat.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/rekigi.pdf
    • http://ddservice-bmw.pl/userfiles/file/65505309732.pdf
    • http://atomleasing.ru/media/File/nubepuwide.pdf
    • https://hurghadalife.net/userfiles/files/jizosir.pdf
    • http://tafoto.de/img/upload/files/96903696602.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608268f971549---5775834096.pdf
    • http://aquatherm-graz.at/files/24123444253.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087648e1475b---fuluranume.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462c1991d1---49918778127.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2o86ht7v8fb0p90r6qo61qfqa4/95976233280.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a6c126b3ba2777ce7b4fe64d8cbf9743/62298776307.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/95e4073159edadb4d1e05ed70f7a8f9f/91540212819.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890a130effe---maxakojezakaj.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b587e13e4d---18582335050.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b83fc5bf3---pudekoxabujaxozolemexotiv.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe21a2867---28806453763.pdf
    • https://my-natural-style.net/upload/files/20322919413.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1295dfec4---jidanef.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0193517c6---96587325020.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/38f071bee2b65ef3b9a1c54e2ba350d4/43832083671.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160775e987a397---8507868918.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758fe716a7---30648802512.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_off0000e812.bin
bfe93d26f9aa6801d718428cc6425a529d1b65031cc75d0ec101228275ac1ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 11032 bytes
font_01_sfnt_off000101c2.bin
d060d689042d4c6a21d43706294d75c1c815bcccd18aef153c07c10fe1b38352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 17144 bytes
font_02_sfnt_off00012e32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes

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