Malicious PDF — malware analysis report

Static analysis result for SHA-256 167c8993c69cc47d…

MALICIOUS

PDF

104.1 KB Created: 2021-10-04 12:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01dec19dfe13951fc8dba0edce10d3f0 SHA-1: 6596f7a5e1cb26ced716ee9316a48fbe6a79fcaf SHA-256: 167c8993c69cc47de3970ddb48f7e49bf2f05f46b1525677194b6af6e895adac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fundacjahfg.pl/upload/file/buxaruxizupe.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dovalojofemur.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/kazodenugiwoniwowolozoguv.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tugikiked.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20211003_E4AA629698EC0F25.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/46595937040.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/11654579249.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/87345862387.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161473592b1256---jixewijibuxunatexizo.pdfIn PDF document text
    • http://kohaz.hu/files/file/kimazenu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161500d3278270---xaxozedew.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f977d893c---71896665333.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/89962682961.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/nizimenofazafifagap.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/77634850396.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/degibotozivonowopone.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f62d3a12cd---34991710659.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nawasepelit.pdfIn PDF document text
    • http://rnralpha.cz/res/file/situmumaxijutasibodefakap.pdfIn PDF document text
    • https://keongracun.org/contents/files/11145624444.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6fv5tbioabuj11p3khvstp16hj/79490532357.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/savotagakomem.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/25439926805.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/30966094138.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/tujukixon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=most+art+and+architecture+created+in+the+middle+ages+wasPDF 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_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 10996 bytes
SHA-256: 56372d4b76e7e0dd743d9e938b370dc47ec467582232a2387eec495fce1aa477
font_01_sfnt_off0001471e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471E 19812 bytes
SHA-256: 75db579d7f02f0bd41da1f7993f079cf2852c7cba2fc78feb6fff6f9d6517043
font_02_sfnt_off00017a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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