Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5d2af26138f2e7…

MALICIOUS

PDF

134.1 KB Created: 2021-07-03 20:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 328c3852786b659fd3e7c01e36b1419f SHA-1: 4914d87698899cd6f2317a8fb1f87c4ae20f12e9 SHA-256: 0f5d2af26138f2e7c10fc95a13c7da9650bcb8dd3425be77f9bcd6c5ea215a33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to compromised WordPress sites and disposable hosting further supports a phishing or malware distribution attack pattern. The document body is heavily obfuscated and appears to be non-readable content, likely generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s8oq7rlhesg0efa3112kuc0gq2/kibumovuwajosifesojuwepun.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722bd4e3a9---geralinebofapixupazi.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/17555050023.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607372964474f---6857895164.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/vogolazuniwokodo.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/roxugesekelan.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/rarabemave.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e4714d4d62874322fe29380c7c90bf7e/rejegufinifakoxe.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/fagipudej.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/557ad72e525b6db878d1d5c9e494645b/nevaj.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/24112318194.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/29302862678.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/5077855357.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7910a2a2a---simifutaberopifawelepawoz.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e7r23m2rae6qmd01k7qbhmvqog/dasaw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5d08qdcsfl890p6aa6fujd6oeu/xatujafepetuzafu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f074c7e2ae---23925054415.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/dasalewanukuxipopalo.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/mojodame.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/raturudizevib.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/puxokanud.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015cf6f6d3---94019225856.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a9e66fe0c10898e75ed8e3d8a769dba2/40776641485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=whats+double+spacedPDF 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_off0001aa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA99 19296 bytes
SHA-256: d25aacc2fc0b92e9c4f3727c211240dda941d091a5205d4e643b0b3e26a94c6c
font_01_sfnt_off0001db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F322 10548 bytes
SHA-256: 536a3b497dc0fbadb6cb42a2af0a8d417ab7d7108f8de47a2639919b1c65cb42

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