Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb49c956d6197f84…

MALICIOUS

PDF

88.4 KB Created: 2021-08-04 02:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2026a62f92987bbdf554a57445afd9f3 SHA-1: 1fd234eabd10de16d53a1e658cb394ddd5019b4b SHA-256: cb49c956d6197f8444bc18ea26daf4eb99767795eb5a30eb5f5ba97975aa20e7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/608e70ucs679jujb8mm1ud2env/fosokepo.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/060c9b21a5f66bd2a62d79698df9c481/32388412886.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784dd60f46c---61901793469.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c60b1267b---penunatasaxanaxorobakan.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1e24100f---diburufewerakow.pdf
    • https://wagaskar.com/media/zomanazogefifevubufugoz.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e54b201---52938823642.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0f062c1cc0197f837e31c7479eb5fbb/sezopenun.pdf
    • http://ankamet.com/userfiles/file/ribipaxukazini.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3v038cgkvou8u5013mn8a0rqro/kuvudaganorixepa.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2445a2727---kesegonusepisikupesukos.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dfd3b630---97016886576.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7d4lujh6bith1c0n5nj49o5rm9/76345810790.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kasagarosorewezepero.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ded2faee217---bepiputovizaveku.pdf
    • http://championshipsportsrings.com/clients/23492/File/2423250132.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cd4572a422aa7d490749a2003a3379d7/13391398883.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/tidopivoroke.pdf
    • http://acmemask.com/upfiles/editor/files/fubupotijalewu.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81198684f---61751837210.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/508ab400df2646078e207d6f79ebf985/zuvixerat.pdf
    • http://bartuceviri.com/userfiles/file/noruv.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2009422b6---xepufuvakatixesor.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3ugap8brne98f5c7734k3pcrqg/pijogupimiwawifuru.pdf
    • http://geoplan.su/userfiles/file/55036392755.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/guninesile.pdf
    • http://group-anons.ru/userfiles/files/7562962979.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+questions+are+asked+in+driving+test
    • 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_off0000f779.bin
7fa4de6d461760e63a20acaf53f9b3eb75c105cb6f1af68cd97cf046d389057f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10880 bytes
font_01_sfnt_off00011027.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 16792 bytes
font_02_sfnt_off00012839.bin
368e88f39266901601997b712927208fa0c2cbf37ae038edf30d7bfb9a54caac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 16432 bytes

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