Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed8725b2a677a67…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 07:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04ccdc6c19a62f91d4765ab4d2e04ebe SHA-1: 0813958a6a34aeed28a0975ddb251ccf896067fb SHA-256: 7ed8725b2a677a67b7af8be58582abc5d95c1e7d8d2aea74a5ac0e2ee739dd8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/77dfb703c5c76a6cfa0dd79c811de120/32375498185.pdf In PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/fonuvuzitozadezanizotin.pdfIn PDF document text
    • http://cssh.es/img/file/75268469877.pdfIn PDF document text
    • https://bloomeng.com/uploads/89478200104.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/91757090273.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xajasimipuwopisomusofebut.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b926d5cf3---19892011069.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca4a72fb6---xanojovobudi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/28798695450.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/42759135288.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/gisividesof.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/diwutu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0acd3229---51856930356.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/witonami.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/56472272328.pdfIn PDF document text
    • http://hijoin.hu/editor_up/kovejefafaf.pdfIn PDF document text
    • http://geoman.cz/data/file/vemovisikibonujepobidavi.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/68353803570.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/59490901946.pdfIn PDF document text
    • https://maisonforville.be/documents/file/xivubobitewodegasisovo.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34701813273.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a2784db67da5b7e9f9fe6d05c42a78b9/nuvisire.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/3141618715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mind+mapping+in+teaching+english+pdfPDF 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_off0000c894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 17760 bytes
SHA-256: 6a8b564a7112a1cb611b5fbd7534b072676410407219a6b0b03a1d4340703c9f
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10840 bytes
SHA-256: 643c112dc2c1239f9eb0e5bd55cf13471777588c15c2b1a1a77848ac5b3d7b3d

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