Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c11704e257d5df2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-08 08:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0126ec3bfad30bb0bb89669be3531b72 SHA-1: 52a5f0a6994654cb8bb22e6993d2a2342a747ecf SHA-256: 0c11704e257d5df27ff979cc7e16a1e6fc36802b693d11f26b5edac211234631
154 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and numerous embedded URLs point to a malicious link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5980

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 https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8bac7d8bd10aab140930ee4b4d664b6/17189726982.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c290041b350422f4d2dc36002d14817a/91324615800.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870116d7b1c---zubudunez.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba99018e0c---5634701676.pdf
    • http://montaze.org/democms/userfiles/file/wutarubimatometoxonop.pdf
    • http://tgtech-auto.com/userfiles/file/76241932043.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/funidopawusejalilipokoka.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160775902c86c4---tikebiwanomijuxo.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/345c484d864db4561d17bb951876f3f0/83340109071.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f9ad87f5341bb33c408ab908cdbce9b1/18896015751.pdf
    • http://clubmaniacr.com/campannas/file/76645123446.pdf
    • https://kodcomputers.ro/2664/uploads/65540102544.pdf
    • http://wernitznigg.at/files/47129471034.pdf
    • http://aaaexpressac.com/userfiles/file/dogezibupojig.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ab6e7a6d0---jumaxegugufabikidumedij.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6ku1m2sd5jdl5i4plqepknm7lc/99365381730.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67e0c788b---46010829321.pdf
    • http://4appsoftware.it/file/78380521061.pdf
    • https://riondene.ch/img/uploads/file/zulazadigi.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0640e0943---vodexusuviv.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a712de5247310061a57fbb0980da6cf/23807626538.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09f5dc8a5---87917672061.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ec8d0369---vatobazedofolekag.pdf
    • https://bwawarszawa.pl/upload/file/30398589214.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=alight+from+the+bus
    • 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_off0000e000.bin
2d5341f5db125af7cedbf02bfef99f2307a12d1906adc54122317a3d17ebb23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 24636 bytes
font_01_sfnt_off00011893.bin
78d4b0ec8dbf0688f72f45856a917c23b981a6c0757271845a7363014953ffcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10616 bytes
font_02_sfnt_off000130d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16792 bytes

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