Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0b4629ece177b4…

MALICIOUS

PDF

79.8 KB Created: 2021-07-14 02:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a2b82f231b1bb89c54cba8cdf1225f01 SHA-1: e9551f1bde8810929e885500274eb334371d975f SHA-256: 8f0b4629ece177b41755ee01c895be1594eee561210e9dcb6f2897162ec6ef34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=consternation+meaning+in+tamil PDF link annotation
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6984c4fe94---fuzuv.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/78035640078.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/72869732787.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6e750e039af777e8f27e64dfa689fc46/wesonudupanixuwilupugawo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0bfd4f4ff4e9c1a044f60f3f826c8a51/wenabom.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/99cd50561729577a060ff7c6659dc03e/wuwabozisebomo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c16d0664e50399581ccf0ca8aa4bc567/sidoratowaz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4683657935---85781979162.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/suk43inan7661hp6pev85pjaub/57363390437.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/955445ef9e385d018c39c05737771d32/zegerubi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/86290999866.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/be3eb79a6e107af16077a3c533ac79a2/20996790588.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dp0n4r68l57vpp6q8ajg12bpk7/namuli.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/flku5dsd81vd0t2a7dpla1lv1t/vujavagagivewom.pdfIn PDF document text
    • https://bursac.net/userfiles/file/wuzugogefuw.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/6815448983.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f69ba90e---37255900131.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a8a9147caee22f55a7b28828f5cee472/dolefosegonoweg.pdfIn PDF document text
    • https://fallsplat.se/file/87896822535.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/90d7a82c82c2a05994417e72c9f02eb5/zonapezekiriba.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fevesotabimo.pdfIn PDF document text
    • http://nensi.si/upload/file/pewuxorujesosepake.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/eed008939c223f318b6e79cd7fe9898a/tixoxurud.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vakovafijebilif.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_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 18244 bytes
SHA-256: e616dbc3841a2d01a19b3e2258ba7bd70fbd94eab7b9ecfa07a0dd29a6dab1d3
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10484 bytes
SHA-256: dc748831cda718fba62e1ba333f2e7a4ce85ae426d8c8e00ae2c05784d052d04
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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