Malicious PDF — malware analysis report

Static analysis result for SHA-256 e496af3fa0719896…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 10:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c9331925e7798d21f83db93d8bf4ca7 SHA-1: 865a4eb375951e513e2767a346ab97d6a63b07c4 SHA-256: e496af3fa07198967f044bafea2801320554d5c7e1a941d6a6df1cfdd6b3c835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=robertshaw+thermostat+manual+rs2110 PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/95f839e0409803dbdc5c956d85927ad1/30926188328.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b292cc6d4d---32355708777.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d361cb990---82501653053.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/nupogudu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b038b352---nofufofutajezomojiwora.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/zasiwu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac7832061---25213615564.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/81c9d283d04d47f1e9b978fe2b5016b9/74165180986.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7bca49c3---61076138310.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39f3ab9e8---jabedivufuboniviwagiwa.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/97374431495.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/96688353320.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/73160844771.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/art1ikh777cvinffi74gvk72se/dukibuwodakala.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910f4d4ba2---59770458098.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/kovugasudovakojifiweloto.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/60577750501.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58697529157.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2d2a71ce6accc870c7d58d30a0fdb3a6/wotaxojotim.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f56745683657edddd3ad69e08269d9f6/pasunoxetedurosugujakokez.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/50658901904.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4419tu0lg5m4ce8tn4n23o16h0/74055331983.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612daad059e15---goxasoju.pdfIn PDF document text
    • http://coachhouse.info/assets/file/pozezumiwidoxute.pdfIn PDF document text
    • https://samowar.ch/upload/file/49064416976.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f17fafa1f0aa395256d3fe855a1c0eb9/zojakijiwewi.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_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10944 bytes
SHA-256: 807d583e89c48840cec8513ea57a102a7eeb9b1f3008210e32740c55559c0c7f
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 18212 bytes
SHA-256: 96880bf18465659ad37afe441aa66bfabf0f0fbfa0381de7a84fa1ebb5881f55