Malicious PDF — malware analysis report

Static analysis result for SHA-256 526585982e076faa…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 17:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3942ba5a0166056e87cfff75ff4282cf SHA-1: c972f649f9c1698e6ff0a0ce0778800467ba55e4 SHA-256: 526585982e076faa8ba288e61578502b92e3ee74ebc8977ba2cdd7d4bd43f927
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26f0642d1---tujimowulenegujesi.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607308ca3c3e9---kagawipenezojetar.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a109b18ebd2---fowomuwelebadudivode.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4bf3be73e---navasa.pdf
    • http://amadpich.com/userfiles/file/85911720638.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/5666f361f1b5fc4566a91a88f1675640/96895543794.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/15440ed54328e209567b6bfaf7378f92/fojekijerotipigu.pdf
    • https://emmaushuis.org/pages/46017238545.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/98c2581e849d1221c61513acd41af721/71855009519.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3e1c32de---49605995631.pdf
    • http://velo.hu/UserFiles//file/vovimonakewuzidopolutogob.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/ligebigojizejufigaxu.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf213572c---40679288854.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0256bf5cf02aa8f83c93e5040a59010e/miwuxosezabebovesuguj.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/rjf1i53alq02gni1fretetlvht/84858635313.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/eedb57a3f1d79f7e842961451368b1ba/vejajiri.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11af9ab0dc---xivebojenif.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a429740b61---xipoxogef.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8acc15aec---84658433027.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f383b6760e---60097382369.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7d693315ea81393bbe118ead52923a5a/tekosetadipukobugu.pdf
    • http://www.contectrade.hu/fckfiles/file/xadasinanemodawezow.pdf
    • https://angkortaxiservice.com/userfiles/file/69881496844.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=purple+related+names
    • 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_off0000e609.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 16792 bytes
font_01_sfnt_off0000fe1b.bin
af8cf5a4b01ca170c2687a32838040b92c49a068b8faf07874ba482c6faed28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 17756 bytes
font_02_sfnt_off00012cc5.bin
319df5d740d6838a504824d1b29aabd3b2c38984f5c1c1c49da287bcd4782182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 10444 bytes

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