Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f39fc8d16664fc…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 16:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d74f31acfd92a6e1495a05d2e9ced2d SHA-1: 0ad78b3217599149b7b622e178cff03c35cd9f12 SHA-256: d6f39fc8d16664fc0bd18c8770b86d8e18e7620db32e59158fec80eaaa337a0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=delete+recovery+photo+apk PDF link annotation
    • http://bhk-aindling.de/userfiles/files/jitubifavatagoramaj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a6e6300325225a1bf6fdfbb85f19b07c/rejuto.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/kakoj.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/22928147333.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/dararonixinusipamosub.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gokizopa.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c475fdc726---pozezeju.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/refozapalowajed.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/kagijunowuseruxetixasa.pdfIn PDF document text
    • http://grafitym.kz/files/file/38755849581.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sawaxaxevevuleda.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91819980285.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/muvoxe.pdfIn PDF document text
    • https://htchninc.com/d/files/sedatabagezesanumidozot.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/8900269003.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/nidatojujezoke.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/petukuzasozikolegolatel.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/5565622282.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134b17199193---98687152597.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614affb83eb1c---21913232456.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nemofukivokejelali.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a885b77f58---xexofugomuzoderiveno.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 18188 bytes
SHA-256: eef98d0e841985d1089ffa4694655f63a61ded15405eb101c7383363fca694a5
font_01_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10380 bytes
SHA-256: db978d982221da36afcc9fe16d256d28192235752c22fa8b53a2710ad3a78b90

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