Malicious PDF — malware analysis report

Static analysis result for SHA-256 b113aa88e243d4b0…

MALICIOUS

PDF

114.6 KB Created: 2021-08-23 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5eb04b0f1d4de4e28551bb5d26982aa9 SHA-1: 1747eecd183302d5a765182bcd328a47fffc4128 SHA-256: b113aa88e243d4b0d06ce96734ad6df3e629883bc01461bcb187d8afa787c049
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple URLs pointing to compromised websites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skkouty.cz/ckfinder/userfiles/files/bipopozazezujurodapimunu.pdf In PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/7277524362.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1245fc070555c373534aa72a16479efd/bifiwekesesepeneruvurex.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0d9cc939---webuwunevuzefalizesano.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/46735919843.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/21331745133.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gekizakufipotezinewase.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070318dbca0f---fibebipejatasutujajabuto.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160708c53add61---7622207207.pdfIn PDF document text
    • http://saydersan.com/firma/files/fukupamup.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rifesurewavogisozolexef.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0c703d64---pefitivaveduvena.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qbnrcg54ceef4cj3li34n8r9oc/62016181543.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51869841658.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/dovupex.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c671b6a7d---fajijupebijiwixa.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9c43c0033310016296a4a4e892f0a498/32539298557.pdfIn PDF document text
    • https://toocapen.com/files/xegat.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dec8a640a---13035983009.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/wariruvufipisulezeguga.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/190783b1341da9dd9b92c778b26eaa4c/31741706908.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hhpu9d9gruqa9vn8jn6d2o9p7g/nuliwigego.pdfIn PDF document text
    • https://aspirans.com/files/file/berifesuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=guide+to+crossing+the+desert+quest+bdoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 10864 bytes
SHA-256: b8669eae99a59b4e83d09dfd42f51a66cefca4084c55dee30f0d0d5444b50a57
font_01_sfnt_off00015d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D54 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off000172c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C9 18336 bytes
SHA-256: 6fd3f4083170edf75bb7689a65e910cac743d198be673f5a728a18b6d372482e
font_03_sfnt_off0001a315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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