Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319c8f4fbfce5b5…

MALICIOUS

PDF

88.2 KB Created: 2021-08-05 21:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de15df03e1ee59df6254945130e87e83 SHA-1: b014c634f8a3785065041a92c3a4df5388353e29 SHA-256: 6319c8f4fbfce5b5aa79e4a94fab530d18c5472f657f7420881676c39c8667e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS links strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=how+to+treat+cystic+acne+at+home PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gd6j4kumqqt2t0dgcn0e00e9ab/dopabigelexazexixiwo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5b53644a46e30ae19e5fe97a8626f819/xemuzisitofep.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/41418280059.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/59146422354.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/jegufujidunob.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/38915399046.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c662a3dfa72---60562126072.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/3622124237.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1b2c69e0fb3fe3af2477f4befb91e8df/33347142528.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608416337d5a8---23995387232.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cosn5fnvkuhn8lppplgj4gjm42/55904448342.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/22684969427.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/rezenevuwabomagitubimanov.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/devonibofumutedegolebiviz.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/54991963785.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/dc3d91acddf8124591d04a4a9dc52769/dogilodesova.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/38615917312.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/magofipemitozik.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/napakoronubatizom.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d329208013---80230612890.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/movowanemudameduwaf.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ca00c2fe8c99bbd6be2253f788c13e9e/99085526468.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee60e163335---89966318396.pdfIn PDF document text
    • 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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 17064 bytes
SHA-256: c29400f7f845dc59c37e6159b02bee53fd42addc25a5a39ec9f0e0dbcf7cd902
font_01_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10640 bytes
SHA-256: e216dd98f35ef480c7267365d5ddfc1ee9243a6e4a1475840ed05c1f971b9001
font_02_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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