Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d2ade789bbed2e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 05:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0bdb9cbde2dfd6e3e8d5430f75bc56e SHA-1: d9f31f0c9fe345a04d45bb9b6847b1b58982a253 SHA-256: 79d2ade789bbed2e818ee2007409af30db33e943771901cfeb8e5bb7a876b3f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=gta+3+download+mobile+game PDF link annotation
    • http://gazdalkodjokosan.hu/img/userfiles/file/28950476.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/28608071345.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/zuxowonazuzupola.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161395fcd6bad8---migobubimiperasu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/21217615006.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3225005523.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760a3b16ff---gukuvofewesaxuvaterofegoz.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/varilofidal.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/kixepatureganuzobixonipu.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/vutidepuzanulov.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/45082842907.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/jifoja.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/fegubogatosufokuxefo.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/bubelonifu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/pozejizox.pdfIn PDF document text
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/xexiragawofenusuzerak.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0bea2cf384f559df8c40c6775304da9a/jewezuxuzokovi.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bunujevivexifimu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/55762779861.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614103a262d3b---49689040751.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/52018640342.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jefixuratodomimunowerel.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/21317893476.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 10760 bytes
SHA-256: 4694bae803c5ff09b5eafc44e27def4b9a131193132ee351ace0aaa815434ec9
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 18384 bytes
SHA-256: 4fec758fd12a88ba989830e86a48254d1bb295656f7adb7ebf2b2360bc3bd918
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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