Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b472c97d286b7a…

MALICIOUS

PDF

90.1 KB Created: 2021-06-30 00:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56de82e67ee3c838561733331a174e89 SHA-1: f96a6dc4d1ed89b19abb2493745cb6a24482e246 SHA-256: 28b472c97d286b7a76b28b794a8197c4a59f4543a2bca9994de963eec423e729
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://inwebjor.ru/uplcv?utm_term=astringent+meaning+in+telugu
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041f468368---kebutilonigomodona.pdf
    • http://polyacer-ecp.com/userfiles/files/20210625_014603.pdf
    • http://fitviewer.de/files/file/loteritaweguzer.pdf
    • http://thepokewave.com/uploads/files/45096619513.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/papiwesa.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989bdf585fb---36735870663.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4704f0330e489a806bb64b98c85a3df5/wudesolelib.pdf
    • http://easyreturn.store/userfiles/file/97117771441.pdf
    • http://anvlaw.com/userfiles/file/70762494632.pdf
    • http://papianiarch.it/userfiles/files/xegupitudujolobopigufivov.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d48975b2f---mijubikoguwovivuwegevadi.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/zekenofeterudu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c674b0e4900f0887d761e18e40a8b0af/93498914972.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f5de36a0c79f06137f5ca224e16e2a8/8532367643.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f0884a030ca535990c434ff8e2199b4/zilazifi.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091bdda350a9---73234356764.pdf
    • https://twr1115.net/files/fckeditor/file/wivavulenolo.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd030fc89---vefisipu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325252f695---90260891344.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7d8a1844d4e483a332151133287bd2cd/53420211268.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccbd2882f---52903435402.pdf
    • https://szekszardportal.hu/userfiles/file/52638585664.pdf
    • https://eberli-medical-supply.ch/upload/file/monuxerovirinof.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124de.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124DE 18328 bytes
font_00_sfnt_off0000c78b.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 3464 bytes
font_01_sfnt_off0000d506.bin
4d64e209dd0ee0382d742c58c12f8584b256ae0c87c418eddc163f45ef15bf66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 22556 bytes
font_02_sfnt_off00010ccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 16792 bytes
font_04_sfnt_off00014280.bin
96620e5e8a57de6f079e67a83071adf0f77612d49f40a20105568edb237e2e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14280 10412 bytes

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