Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d67e5fc10756d86…

MALICIOUS

PDF

74.9 KB Created: 2021-07-05 09:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50ce06558b22cd4fa0e9319a3cbd25c4 SHA-1: de1427ae7f36ccc07f5abc69d971c8e3bd6a84f7 SHA-256: 3d67e5fc10756d86f36d188785aee9e2c9a0b155f972c61ee364f9a562902b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content or phishing pages. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to exploit users via social engineering or by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=15+days+until+christmas PDF link annotation
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/30c9aa2df57661bc322c882c2a6abd9b/pezopawimu.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xenogekudixowolefolikalur.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/61224316750.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/nanurikubuvenomu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/644fc8274229dd138f93937ca33bcee8/66411781805.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jenisepidu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8499e6579---pezibidewe.pdfIn PDF document text
    • http://proxima-design.cz/files/file/buxukuvovunedisevikuve.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/deejcrv7ovp5jhb1dbecfl28uq/95609673419.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c196a457446---20305296457.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdedb0c47d---fagel.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/mukavowefe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a508b9202d---66403516306.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb44e5f3148---56410015805.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a78594b59878ef20672fdf05fffd91e9/relovewate.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0b38c300---42628393760.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/palajopareza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae2e32660---miloli.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fdf08c4743e920bece552a4dd1381342/pijojaxu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d652edd2ce976a37493bc09ef9ded0b4/maxezitaxofi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d76dd98e---pesizaxefe.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/sobetu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/jogizanatusomelewi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rixipebow.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f90ea485---zakoxawexezojovozaw.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mrkeimf0nok2nus808v8mndtdb/vazizabizojiro.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_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 10684 bytes
SHA-256: 93032d156b98302ef8a46217d7c7f62a71b8ea11bc06c0fbc10e2a9682ccb6c2
font_02_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 16412 bytes
SHA-256: 68914a9a571552778231d5ce70f88ccc0cda0a05c7631c66d42b3a7ff2fb8921

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