Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd46efa97254797d…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 04:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36cc8882dde1eb1b999d2b870f1f4339 SHA-1: 73c670fc7a57d51d84f820caf7a62c343ea3f478 SHA-256: dd46efa97254797df233810aaa2227096455107cf6b67e498183310b5c9a8cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs point to various domains, many of which are likely compromised, to host the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccde2bae916---nuwubuxiwi.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/67956707484.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/65744bb783f786f76d8f20b67786362d/tomoginasesamulebumexupu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/34405033011.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/notewegunezo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/waxigimuga.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077826e1d64e---19611640362.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160763c898d2e6---mivulusoletonegezoravase.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045ed6166bb---53762565159.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/75729c9481b5a8e107ce38da66f5922b/denewadupumiko.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11d899dcd---mugizulupefibemaxowet.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/46237336150.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f72673344---66488573971.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/14395979551.pdfIn PDF document text
    • http://huntland.hu/upload/file/sixigulewariler.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5biq88lgbq4dqja013om76fib7/54080880875.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d793c9c51df---32408809768.pdfIn PDF document text
    • https://angkagenap.com/contents//files/runisaliritanavewiberoj.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/797faf935892391a38204c92f6d99daf/mojamazowubesatelageruba.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bopazabotisuwaf.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/20143996605.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kojafi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9c25a077a927c68b6a424fa92fbf1b28/giwutedob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=integrated+maritime+managementPDF 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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10208 bytes
SHA-256: b063f211dfbab5fbe470e764d5e467c19187d696270f3acd36c448748a4e5455
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 16884 bytes
SHA-256: c43e578543bac99414b4c8ab9661a1a6ca7fa82058968ff2563939333b735cd0

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