Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b4220cfba2bd82…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 17:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd68b2069bd2b5e5d5a814ec16bc85d SHA-1: 953132f218badff80c7111da72125da11907e8d9 SHA-256: 07b4220cfba2bd82a7b0e7d203f926904cadca2d4c500992734db74ae6fc12c7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_JS heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=shadow+fight+2+android+1+mod
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/68a0ece1b0f5d10160144e0b33ced017/moritozivixaguvi.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/46601990935.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397832ed494---20491562191.pdf
    • http://trieuduong.com/images/Download/67943792112.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/ronazadolifuvelurofirog.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/4656799458.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gibosode.pdf
    • http://hqshop24.com/userfiles/file/12058422277.pdf
    • http://dienmaythanglong.org/uploads/files/vofunumadob.pdf
    • http://gruppocreta.com/userfiles/files/gagijulivetozel.pdf
    • https://coverline.ro/userfiles/file/sudalotanol.pdf
    • https://rhuyscampingcar.fr/images/files/98063890282.pdf
    • http://aal.tw/uploads/htmlupload/files/67703044781.pdf
    • http://dataprint.ie/uploads/file/70467313747.pdf
    • http://hidramaco.com/files/files/52088427643.pdf
    • https://ww150005.linebot.net/upfile/files/20210914052314.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3363b06e---jaxidupibajuwerukot.pdf
    • http://tdbm.vn/upload/files/noxafivaxev.pdf
    • http://www.drivingschool-brno.cz/files/files/nagagijezin.pdf
    • https://nacituran.com/userfiles/file/bowejuvafejefafe.pdf
    • http://feuerwehrobrigheim.de/upload/files/34170158181.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_off0000ccef.bin
9759ec03ecace767235b9c88bd54ea64eac50b89dcc9270ca137368d36b5eee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 10788 bytes
font_01_sfnt_off0000e589.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 16792 bytes
font_02_sfnt_off0000fd9b.bin
9dae7e51eb15cda9fdf0619903ff5bb62ca2a4587b262f69c7122aab6f685c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 17540 bytes

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