Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc4552cc030b26b…

MALICIOUS

PDF

90.1 KB Created: 2021-09-10 06:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e02b1c6bb863546e9bfbe8636134195 SHA-1: 6c70a1d35964465e56f706c319b9889126f5c6b0 SHA-256: 0bc4552cc030b26b838ef6cca79af1c130543e75126a16f065ea27f5f72a5aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the PDF functions as a link farm, directing users to various compromised websites and disposable hosting. The presence of external URIs and link farms suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=watch+the+lucky+one+full+movie
    • http://obkladlazby.cz/userfiles/file/gotabivugokurozafuvuw.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lafkpjl0jro812mbi3a8vrod83/94583279177.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/h67lgvhj78vq80lsdu8rf526hc/93929293099.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613832f171e43---luforiporubaj.pdf
    • http://inteko-tula.ru/f/file/remerajesizoxexuw.pdf
    • https://glamweddingdesign.com/userfiles/file/nabetanevozufavufi.pdf
    • http://tajeer.co/userfiles/file/xatapojix.pdf
    • http://damnoen.com/ckfinder/pho/files/tusesalikidege.pdf
    • http://purofirstli.com/userfiles/files/45532846450.pdf
    • http://xn--eyt274i.com/upload/files/zomeregagunebokewagabuv.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rt4n72kc36chdk7hpqs1af6j8b/zefetabekereloxiditadugo.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/36348118930.pdf
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/5186701759.pdf
    • https://cv-vezouze.fr/media/file/kunita.pdf
    • http://medizator.ru/ckfinder/userfiles/files/75917443638.pdf
    • http://cen7dias.es/userfiles/files/64739055353.pdf
    • https://vresponse.net/userfiles/file/9544953223.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/53853815582.pdf
    • https://daotaolaixesontay.com/uploads/file/87812165770.pdf
    • http://apexibd.com/uploads/fck_uploads/file/11841269397.pdf
    • http://christopherspubandgrille.com/userfiles/files/7199371173.pdf
    • http://murielbellhomes.com/userfiles/files/mivuxezivirisid.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210905_720FEE9C7BCDB442.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d81fe5052---kojawabamovisulolowur.pdf
    • http://ydchem.cn/filespath/files/20210904193138.pdf
    • https://bonaparte.cappencms.com/templates/files/tobufodagugategepanarukig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 16792 bytes
font_01_sfnt_off000114a5.bin
58ccaa5aaf236286fd531ba6fbaa7370fb281cc4a5b427a726715267e36af17a
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 17596 bytes
font_02_sfnt_off000141e2.bin
9dead97596f434c3b5ed56746c6be2a24e44a47fab41d1cb838d27b6fb17699e
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 10700 bytes