Malicious PDF — malware analysis report

Static analysis result for SHA-256 86415f18e466cc9c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 10:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ccf5ed7cd3d9eda6aa47c30afdb9aad SHA-1: fb67e7f0b32a9a44ae1a9b02395b1ab3474abb47 SHA-256: 86415f18e466cc9c99a94e404ee405fabb57e114728750f09bd41fdf0d654f11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=depth+first+search+algorithm+example+pdf PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609482288171e---bemewugazejelevopuguzozu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc47cb7af862a47d30390af01cdd7fdd/70157719329.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b972114300---josezugexej.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/varemigalurevipidotenesel.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160948dfb8b6ea---89147965643.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836661357a7---30058641220.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/62775193428.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160724e811e3db---dupojaguvuv.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/55652584047.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195dea6fe1---gatiwabakomik.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/971c263bffa71951c55cfbdb125829c8/punupovike.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/fuburukifuvolalo.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/naxorirukukitiw.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0958207f6a58fe117ed479b0eb214d4c/lejesatezonokujurediwe.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8add4a48ee---vefige.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c083d3daaf---58149592093.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdd124d77---munamamekubowulej.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/64076203890.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rcjshaohe53ngj3bfp5sqh2261/buzitibepiviwaf.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/raselugaxegex.pdfIn PDF document text
    • http://abworder.com/uploads/files/73231086398.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/13601366777.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/23205603965.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ac06dfce---sozafo.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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 17456 bytes
SHA-256: 5e94981da0c6cae148a84130d9d145cad15319b91e6b0f30aece8783377ef680
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 11064 bytes
SHA-256: bc318bbe3ddba606c9e5bcd8fd5e902afb5e23d07b98616999c4c6d66c11a48e

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