Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d39a6f6627d0ba…

MALICIOUS

PDF

99.5 KB Created: 2021-07-05 06:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c98d62b1011450f54e56d90fa4944933 SHA-1: 0c4bea63a7a9cbd6857780e606296567c5a7b663 SHA-256: f8d39a6f6627d0ba0d637af476b8a6076471e8314811ed9c0301406dd3927c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these compromised sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb82167781---34338442660.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a0cad1bf668d678985d7d26852efd03/daxezuk.pdfIn PDF document text
    • http://teraval.cz/res/file/56224892743.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e1d0f601b6e641444f4dcc22755b9dca/58464890024.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20e65c357e---betaxalabakakal.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/80067147508.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/80192600599.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca7ac71bf---71324656472.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/tagorazini.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6963021be---45301498643.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/ketokero.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/onf0veoe5mu19uov1nbvvv3htc/11196370937.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc20e8c44f---62362753397.pdfIn PDF document text
    • https://ikima.fr/uploads/file/xasewamasorubuse.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcbec92186---82150384495.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/402ef51ee4f8f407160ff52954f3d3f8/beruzatuvem.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a122e1be2---nubidujatopeligugoted.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e025f71039a3167fb69f0ae01e17642b/87564229395.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/korokupuzalutejeravofu.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/14958942622.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3a71c412---tipevumitopusokopudote.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a125511b7b5---xikudegavetuxutiw.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/61635009617.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba761e5ea---domalusemusomola.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/12ec775e40039226efeadfdfa31fa21a/85625596644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+molecular+formula+of+styrenePDF 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_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 20380 bytes
SHA-256: 503ff5c30a61a5c894f8d4bae7fed0310ba817b9e60b228b1bffdd0409869b32
font_01_sfnt_off00014fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA4 10808 bytes
SHA-256: 61a03638014ad581b4f69c6ed5d3894739d4d3af7c745df86f3bb6df0aa55edf
font_02_sfnt_off0001686f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1