Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eca425779c72d8b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 09:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e25842a59e964db01559e3fca7d7086c SHA-1: 1af5fd8e9a4a3feccb2d02b220a026dd95511ede SHA-256: 1eca425779c72d8b4b98c8536dadf2d57e98c222e909cdff6f0a965096f72d56
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=past+tense+exercises+for+class+7 PDF link annotation
    • http://ohxto.com/uploaded_files/userfiles/files/moketor.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kopatewaxiw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vekogarelobipo.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/97190818760.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132269697ec1---disolo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb969e16b---vezikida.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/dewimegitot.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612eddaa33c35---52854447412.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/58419275229.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/kesoxeguxizomore.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/50da1feef838b4d34815ddf97d63ab08/27310919219.pdfIn PDF document text
    • http://houselandia.ru/files/47201354665.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/fikufa.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/sonef.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/47938246816.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/rukosaxopise.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/80194798461.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/45861312130.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/zugikovovukasewade.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613195e7223a6---soduwilagefudeju.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/maxilimaribuve.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/linufuluruvagubil.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 18348 bytes
SHA-256: 4e5ef0dde2b9758500f5b305f77da294ee37521ab950291c639320d74784801d
font_02_sfnt_off00014448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14448 10484 bytes
SHA-256: d94d8862cac24ad14f4b97c0ef9d29cf53e12848a0a418dc6753b32b561ed38b

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