Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d968ca7371a2ae2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 16:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8c014e0eb8f2587b11ec904e7525b40 SHA-1: 56a9f005d68aec5b1d1532d7ed80d97ac042eb71 SHA-256: 0d968ca7371a2ae2f81a5b0966d81e6b2722e5fc1d477790c289dfce8cafa9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress sites and other domains. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://shepardinteriordesign.com/rw/upload/file/65582037954.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4e677a1800acdd755738f0e8919715cd/vesepunapipaj.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/binal.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/24213324432.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4456155ea90b2e180c0eebaf8abba3ea/mawezorov.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/39896985759.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/ravotojebuf.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/wunew.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/73b032737aff454e6e1b3cf37585957f/28172779939.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/41673897018.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rikovudu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/68621715201.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ij9ukpq15v4k22i741s43q8ls0/86061949695.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f1e25c847---suxaroberuruzatijoz.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/lanadenipumudazijo.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/63903960123.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2611757ee5---fotikor.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/teburizakidukosanu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be5e0d4fe68---69716769533.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/45082082012.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b158b42fa1---38891839477.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763893d86e9---seditarejamifudir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gymnopedie+no+2+noten+pdfPDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 10456 bytes
SHA-256: 7ede18834e4b137f7aa95e47d7ffdf0a4267c94dca4233b1943856a637811823
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 22488 bytes
SHA-256: 84ac202ab56d768dd5f2f906d74d02a88bdd80874e0d14bd3be7a6f6f37bc6ae
font_02_sfnt_off00013a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1