Malicious PDF — malware analysis report

Static analysis result for SHA-256 492c32874e68ec42…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 06:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24e44ec9396dfd1afa00cff3a2332240 SHA-1: b1c946c9bf6caa9a0c95a587da53fe37105f2c68 SHA-256: 492c32874e68ec42e3bfd614eb82cdfde1e119d17038232de6f436070543e3fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and several heuristics indicate this PDF is malicious. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to manipulate search engine results or distribute further malicious content through a chain of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://omgmediatank.com/userfiles/files/kitejixotegawilu.pdf In PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/kevodafewojaw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe6808630---2152698456.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d0bc16934551588d625a8bfa11cddb1f/rulevoz.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/41493286926.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/nelokaw.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nudinesalevaronidojimu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vanafazamufinudebufur.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xamozutewolurezariba.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2b157bd30---zedakezuzifituv.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/54248aa360f51cc382a58cab8e8a2994/dinofivoju.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f5520247---vuzowojenibugij.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/81524284231.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d28e6d10b---39814642596.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/4a426d2055dc006a00fd377d84c43a52/95175330492.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a377a9dc21320411277db5ae9fa445ba/94336976075.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/34622219080.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/071b54278384fc86db06508554f84d38/vaxatupapiwib.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/xodimejakupuvikobukuzup.pdfIn PDF document text
    • http://www.bash.cl/media/file/milabinozolap.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/77130354992.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/lekuxabexululum.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d7f33f224cfc895a960e2c41b9704ee6/62662755967.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kudozurex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=orvis+clearwater+reel+manualPDF 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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10548 bytes
SHA-256: ab0d46bfedf59c372b610aef4a217b077940ca3cb0b5b3ea0fca58fc61ba0cc5
font_02_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 17716 bytes
SHA-256: 13dbb2c3754049cf0051ddf761b3e76f460bed5805b64b775c8df60f89539c2c

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