Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f823b077ea7b66…

MALICIOUS

PDF

72.0 KB Created: 2021-10-07 21:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a97e97821568a5405fd8de529850bf27 SHA-1: 687263c66d2efea1c0eeb68ad591afffa9323c69 SHA-256: 69f823b077ea7b6676099b82d55ed019a9bb5fd4e8189d8e275939fa69a29470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pointing to potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=personal+and+object+pronouns+exercises+pdf PDF link annotation
    • http://www.tramag.pl/upload/file/mawifipogibawa.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/vokatunoxavikowe.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/82500516591.pdfIn PDF document text
    • https://norservis.com/files/files/ziximuvekoj.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/24902890365.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/15796239220.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e29fb8b8d---domema.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/28860605391.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/fujifot.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/butenejugugenojor.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7a695037---80227595764.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/84677949078.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0fa26d2af---64705250933.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/mixise.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16155991e9bb34---tojepigag.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/wikibitodutorile.pdfIn PDF document text
    • https://equalland.com/uploads/File/zebowawobanifipupov.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vavilopasi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/21180505604.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/6400549001.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/rasuzovolebosufomuloneg.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/58042910149.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/82858699302.pdfIn PDF document text
    • http://ellev.fr/upload/files/jizomafa.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_off0000baa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 11088 bytes
SHA-256: 84c869078692f319f5df753c444fdfd16d4c65023f9b2f52a92f505f666d0033
font_01_sfnt_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 14960 bytes
SHA-256: 15caab93788ea083c6fbf016341bd7c9ef7050c76ec2e7515e708346bb6d4dbc

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