Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6c3a037ac994b3…

MALICIOUS

PDF

89.0 KB Created: 2021-08-13 03:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecd3aae00bf66a1ec73b9cbe7464d3ff SHA-1: bd684c0d2f4512de3c89c2ac6e12a72d32b3cd3b SHA-256: 2d6c3a037ac994b3a25b20afea68e7f72732177682d094858a92f123aedf1ee2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple distinct hosts suggest this PDF is designed to act as a link farm. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e6a08e505---kidasorosolojesaxajukil.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p613gaj6v0sh5ivin0rrjee87b/10450570287.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wufomimamekitu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/557ba6822a16caaf7e271929130df818/vaterapiwudewanitata.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4c25ff8373b7f9111b1fcacbd140010c/wefiwaxomafodulezisij.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f2f6d73519cfc4dc450bb46d18d53554/14315059913.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/48489979404.pdfIn PDF document text
    • https://mimpidia.com/contents//files/38847584918.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/3210471985.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/5bef5dd17e98f41f3b93468804c5c8dc/tasenefubojotutenodafula.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/8998050738.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d9926bb178f98dfb5e9c9af912881a7b/15400099315.pdfIn PDF document text
    • http://cosyromania.com/media/file/14556963955.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kejoxapifuzekadafot.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b0fde77d---lelizurupexojegel.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/110621303978.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/46530227977.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/jutodis.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda0535742---56231739452.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/754eb6072b547c9ed7f59ebab7fe9f0d/87601881538.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da9ccd1416---17624106973.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1r1gl7krke81pktn4377ja7ian/wepoki.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/70065830486.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0ac27363---30446987141.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/zamigefanamikodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=echo+dot+3rd+generation+directionsPDF 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_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 10760 bytes
SHA-256: 46627214c0b8726183eb626b9a6b1bc95c2dfeec42006eb18c77632c206feda2
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 17336 bytes
SHA-256: 49a1bae044f00d4820be9d32a7bebbd1560dd65d45cc0e9bbe31d218959f4aac

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