Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fc3c1b71ea8a8d…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 10:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99729af104be23047a487924c35514b9 SHA-1: 54f1626ce8d15827bbd25d8fe6dd24da2755d01a SHA-256: a6fc3c1b71ea8a8d5781b00a94c57c3bdabf4bd2a66a58dfe052a24fafc60e25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=fig+and+goat+cheese+flatbread PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/35040107343.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/63043665197.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1lj60e2n51q7ctfau8d0mo22n0/topubozapukirevamawus.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40cde28920---13493239627.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5055663a---tozazodagafexalituxok.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/61601026528.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/22552607331.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607716b30c703---54118026652.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/fixiped.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/27823004640.pdfIn PDF document text
    • http://iwort.de/userfiles/file/tajexalakujop.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/11547411958.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/gikekezurenavanuban.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6puqinmsmlb77a9036vq8rbcbr/marajitunesurireduralup.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea2765ca52e126978f5fad0895af7568/jadafudelu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612acbc0c1748---savuvijoluk.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210609_A0176A191037978D.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/24015045917.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nogatapaluxebuxafebiban.pdfIn PDF document text
    • http://inistor.com/ufiles/files/rezidizuneledapoz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12830244662.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ad0fcea51---38576655616.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/29001a074912c3e12f56a4aab245291a/70256945187.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd7de8b89ee9564a95938171a212fc38/44280416103.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_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 19196 bytes
SHA-256: 1553d7e1ad7fd00ae99b737ba73e08250a4269c832f073027f69d49b68702c0e
font_01_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 10872 bytes
SHA-256: 9b3293c45bcdc4e46ac4a20cd8906c60fbb348dd867b27e94a00c5cfeb90717b
font_02_sfnt_off000148f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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