Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df0200682e3fa51…

MALICIOUS

PDF

88.8 KB Created: 2021-08-12 22:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba9eee8993a4597d4c1159da29fe6e11 SHA-1: e73f28301e21631f462bc5ef39b0e327c3bec846 SHA-256: 6df0200682e3fa517a3aed44cced2a9cae0e054c748a69a71956cfeeb8245bb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://huntic.ru/uplcv?utm_term=apc+accountancy+class+11+solutions+pdf PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160880188e0630---bogebexonurerekejuw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/i3fqtt8vog947n5l19okmvvhjo/somikitawenejedizudepevu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/98r6njkkputul61c2d45k3s151/9405340058.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021073121024530.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4bcdc11ff177c9d4399c651fe0ef49ba/79316654010.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/333jb8tp1r2bqfsfrrbvjq4goq/dumijazutumovoluxozevaju.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/mujosa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c20a7b0baa3b22c273599b3f3d06be39/pigeret.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210730021851_w3wefo.pdfIn PDF document text
    • https://digireg.li/upload/tifududojililulejokenifaw.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/84365192699.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/novabugi.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/timofafazifuja.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a358f738c7cd774f3661a252da956763/ruvuvuxiwurumizelo.pdfIn PDF document text
    • http://elm3rad.com/file/29155938492.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2d9329c1c41e0dd415007f019a173983/15661445219.pdfIn PDF document text
    • http://vinmexindia.com/uploads/kiruregazanutev.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/logavasanewodukedox.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2df571c9e---sinavi.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/74bba7ab483a2f10ed5a778b41d17bb6/disowifexugafexoj.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/pepitivavagekepiloduseta.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160745034d9ee9---nuletuditosizubawal.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/11517984102.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_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 17500 bytes
SHA-256: 58e204963ef098bd7f5fa001331263b63658d7028d1836b943ba4cf21a8a4619
font_02_sfnt_off00013c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1F 10628 bytes
SHA-256: 5bb3568aa244b4327b600904ed069c8f93ae8f2fa7f9fbab7bdafaec22ea3095

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