Malicious PDF — malware analysis report

Static analysis result for SHA-256 d379ba748b1ceedf…

MALICIOUS

PDF

77.3 KB Created: 2021-07-26 12:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3322808e4d205c6412ea1d6c6a16aaa SHA-1: 8c75f28ade04be650eb4310640bf8df3b05bacb1 SHA-256: d379ba748b1ceedf6a73aaf7ef8879bc37688f0127012c941c61ff530c839d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but reinforcing the malicious nature through its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d165cdfa---58381898037.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ad26761bfc42ac29b0b438bf9c65c7e3/jafimikumo.pdfIn PDF document text
    • https://telorgabus.com/contents//files/lipizuduvodagun.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/6765759091.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160855c3346d44---27716418310.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f316cf7ee18aded46597a7d437d92eb4/fiwemebu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1170e6cc4---lodakazenel.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/65310453648.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608223b58b55d---fejopiwuwudibitemosaxu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cd2f2f18---jinerewudafekudal.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/20183006028.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a4cecd6f29b5f80ee443e66020f15251/velozulasas.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fibodetusunosiwokunilowej.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/69795603983.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/20299671096.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/39877733192.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/69a5ba4da480cd2042bb35bcacb07fa1/lerijiwixizikibemolotolez.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/54974786330.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7a5fbb5---finoguxe.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/podiw.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gajoxurebudo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/05245d0e2e7670d7ce6cfc33b39b469c/zadijutasoweguziwov.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8bbec83f66854fcf2e08b0e658255a4/rozizor.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160861d08bc717---86072471836.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7caeb8a9515a00f2d1f7a88a34145b91/sipoguzunewamalezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=naming+binary+acids+and+oxyacids+worksheet+with+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 16156 bytes
SHA-256: 24c67bbcd44143a4fe4abbb8de934842ef4e346cee72e2dfd4463ab6d7f1a6f5
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 11280 bytes
SHA-256: 0a2885939cf2b56ef40ff574ffb2b676043e688fb88692ce8a141f10ce5574b4

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