Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fe2c846ade7076…

MALICIOUS

PDF

78.3 KB Created: 2021-08-23 17:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41313bbedf04cc3f0543a54d844abea0 SHA-1: 28040e791e131a4adf8af28724b9d04853219ed7 SHA-256: b6fe2c846ade70767ea8c468b4654418d7510b5c4b9390a7d44e796354ee7a67
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8512

Heuristics 5

  • 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
  • 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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca7b98ecc2---xugasepoduzefimibi.pdf
    • http://stolizstekla.ru/userfiles/file/zadaguxitidizozesabot.pdf
    • http://alanurturizm.com/rsm/files/46823768174.pdf
    • https://observatoire-omic.org/documents/file/wilewemojimawemofakaguduv.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/81948509083.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/49972124277.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a311952f43---59985357241.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160989686f1c34---wulaxuvakivekekadixadi.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c566466f0369093e3911c5cd46194b33/degamotabogaz.pdf
    • https://miet.hu/kepek/zaxaderegakidubuz.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97f46efb372ebeeb0a63f8f914cf9de7/gawelozaranitojo.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/18051771109.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9195ad31---20256477432.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/116b52f16f4e86ed25a819031402c2a5/lexipazerabozixinajovipom.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u09kt1pdum74fckurmjgorn32k/62421259593.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/metitusogaruzawedoruvedu.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/jatodonufokuxuleripote.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/letawewikowufowabimato.pdf
    • https://ewastexperts.com/userfiles/files/30698913615.pdf
    • http://mikailang.net/userfiles/file/20210501093254_1450126369.pdf
    • http://chandravanshi.com/userfiles/file/81946200833.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a49aebfd---fuditagizujimesofopogibax.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083f157c135a---dabajefugagovezew.pdf
    • https://digireg.gr/upload/32839370962.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=invert+black+and+white+photoshop
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c7.bin
0b709d0f202c63e874f925ba4c23ef0a57214ef3d68b28db63e2bba475504d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 16932 bytes
font_01_sfnt_off00011ea7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16792 bytes

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