Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6b4bce55b18d73…

MALICIOUS

PDF

88.6 KB Created: 2021-07-23 19:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ee64d37452467b2d799dafa985fbff3d SHA-1: 18aa336aa8d90c08ad204b869dd2ff76ca61e491 SHA-256: 4e6b4bce55b18d73ec517dc4522a11e81b7677fb8a99003dc4312258f8dd7199
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to click on these links, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://growyourmoney.in/userfiles/files/10118148069.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/bf4c703615a1ae203163e200e8553813/719942879.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ddf20c3a687e9654f3c69988fcdda5c8/78348072542.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/612dc114c39849b6f45fd743ed595cec/79158767756.pdfIn PDF document text
    • http://ipublicity.cz/data/file/vexejeka.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878943eb07---gimezufikiw.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e839d46562---xowatapanuz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f33396038---retapovuzizevufobapala.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c192e1d3d8b04ce832a899c8ed175422/26724570047.pdfIn PDF document text
    • http://falerisztika.hu/tmp/7642822857.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/10485615233.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/edc17b860ef2f9351bc3e297068c60fd/zolobovidimofiju.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/bodos.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/33435335395.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/ripezujo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/zigazizajotede.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fea6b15de---fujugusovulibinotos.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/62184b3fa7aa4c88ba20fb767c816ce3/bevoz.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160704dd37846c---nesugabobebizew.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/61714712413.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e4e5fed7---14824336268.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/puzojawuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+autoimmune+disease+does+the+stay+at+home+chef+havePDF 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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 17132 bytes
SHA-256: bd217fb8af1bad2a8b09eea1ba7b024c6d60ebe1c0bc3219300f2043fb0f6db7
font_01_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 10868 bytes
SHA-256: cb504d4448b8a7e9f3fbc8abfac754a569a5b254442a018afc4c9246d4b36f4b
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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