Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aee5c44a3051918…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 13:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 208cc1f85e8301dddf38be961c98e985 SHA-1: 3b278c2a1f7f9f2b5a0f754090f9cf65e0363c67 SHA-256: 4aee5c44a3051918a5fd9216ea911dde798fc5338cbee3c8333932083d6686a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.borzabadi.com/ckfinder/userfiles/files/jusilasorevuwe.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d0ae185f---taferidawul.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/23399001954.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/digimimoto.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/15695453347.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/timuvapaxuvakuzabaped.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/81242957047.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109131526093053.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/21076778565.pdfIn PDF document text
    • http://greenld.com/userfiles/muvule.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405824cf34c---pikanijile.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/wivaxigopepetifejavadog.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/43474574176.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/25218476187.pdfIn PDF document text
    • https://bawauang.com/contents/files/powizagipo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lipisifonumigofa.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/23399947844.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/33396932792.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m8q5ps6kshqtvogq5scme47ii6/lugenu.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/vujulolesesorirano.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/67016174823.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/17587933166.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/bikanivisavoleru.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/taxalefonisifalipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+analyse+your+own+artworkPDF 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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 10392 bytes
SHA-256: 402bc1a81224696b7f7a5f1ed5a24924461b286e19feade19169c287ef96a58d
font_01_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 16328 bytes
SHA-256: 96bc92149b5fa87d44ea3ebb8d1697baf527375eb58db87943438990963e75c4
font_02_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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