Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6dbc7244c3b0fd…

MALICIOUS

PDF

100.5 KB Created: 2021-08-01 14:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2261f9cdb7f9cdb2b8f05273a3bb0658 SHA-1: 9942e31cc64d25d23105ffdb7b13cba3cab4624a SHA-256: 3d6dbc7244c3b0fdacfddb1e75d8594d354a3d8a91855e1428ce2b5f9df690ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaowei.tw/image/files/20210720_101025.pdf In PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bewuwawe.pdfIn PDF document text
    • https://emmaushuis.org/pages/80451785346.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/780a22d1b91de8d0898245c7fe320599/207225321.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/8970645081.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5a13d11b98c7d7aaed21b9ffc80c92d5/61867046929.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/af8103d38d899d1724e2bc4162e3b652/wijudafojiditejidit.pdfIn PDF document text
    • http://axwelindia.com/uploads/rusozukodumik.pdfIn PDF document text
    • https://ocw.tw/uploads/files/bexanusuvufijewuzasisorev.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/desuvajadubarefusin.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wexesakuguxugum.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bba3d94664ba827d8abf0075506a2050/98151961241.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kavexuwekilunimafagoreb.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/togugeliwinokosidesiromi.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/61229389589.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36996247056.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c59903c4d---gusukuximizite.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e520415017---xivuxizojuzim.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a8d565ec6b55a1ebb27ca952eb286ca1/9687226370.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i5s7fqc6efc59p62bpvl8jnaob/59852012441.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/tijanarivogalepogunivaxij.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/708fef774c1e01e6da43f592f4307601/vabafakuvunozipasulevom.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a942b3295a9---xovidomek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=salon+business+plan+formatPDF 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_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 17000 bytes
SHA-256: 1f40980b0192ba78847a0c145259cf2202081777c812c503e5f769fd790ec821
font_01_sfnt_off000150aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C1 10832 bytes
SHA-256: a0c16be2c360bfee46639b28cf6072c22f78ca48cf45cc150e7c45e5d61677d3

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