Malicious PDF — malware analysis report

Static analysis result for SHA-256 f519d988fc88689e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 01:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81bf98c1bd43544cb5c807c13b38e299 SHA-1: de1c42d3bc1358668614ecb98a7c7a6b0c38c82b SHA-256: f519d988fc88689ee81dd851206ce3a099b6e31739efd55683d900acb0816053
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised CMS upload storage. These elements strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=digimon+encounters+apk PDF link annotation
    • https://matratva.in/userfiles/file/tabakumurenulaso.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/db9c785b41705e012de87b1d44ea4795/rekiwebenavebosafig.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3ea1b34edec5e0b503a568c557e063b1/60883492122.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/11677328249.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/luposaj.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/wudoxajulasoran.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e68c09c4a8346e9b9d4f7e43046f16f5/sewasejeluvubowafo.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/96828652037.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd3a8ddf6---zitisuropidepoxena.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/86510461811.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/noruzokekasox.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/viwekidage.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/3927803409.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73022319461.pdfIn PDF document text
    • http://prestopc.it/upload/file/jorewobaka.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4df9dc7d5fac4a1b0ba7dc9e59f4f0d5/94787168711.pdfIn PDF document text
    • https://thehouseproduction.net/file/65710743362.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/dileliriwenewezob.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/26385095917.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/detozi.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/wajavovabebelogolisisobis.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/80185531214.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1e53a613---romolesodalijalaf.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 16748 bytes
SHA-256: b72148c1491e925992115998a3b906fa68e60f9488e07e2d69f5037592db8f25
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10864 bytes
SHA-256: 20c81fa6f63f735dd0c9bb2d6ce4e6efc0642d4a7201dd9fb635afa1d51c6150
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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