Malicious PDF — malware analysis report

Static analysis result for SHA-256 0797f69a76782b90…

MALICIOUS

PDF

79.3 KB Created: 2021-08-20 18:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6d351b3eecce7dd3e2eb5b5a804238d SHA-1: 0dc391108cf97ca0cfeeb2c134b910de3806c03b SHA-256: 0797f69a76782b900eb5d72c7123f45d1ea88950de87762cf6a94accfea01d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. 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 presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=how+to+open+a+sentry+1330+safe+without+the+combination PDF link annotation
    • https://wineart.online/userfiles/file/26837372507.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/38608509149.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/3182549419.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/77735246939.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bbcc5b77c15c8529755d94e07f8986cd/35298697955.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/jesozisupiwavetitu.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kesunal.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D5F1A4459A4.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/16890158496.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/83759681088.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/66911723539.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a66bf506f7db812a9a0e2fd63082778b/25319815189.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/kufibixilogejig.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/70541406774.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qafsbgmi2v4j62ejch3ir47so8/2871101657.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/io9n0k31h3lmtjps4l8408mmk7/5342313751.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ec72a2631df50f52ab79fe59e62a1f58/79102805961.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08163b8519---47543649192.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/seguwalomefagavag.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/jolekuduluni.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/17bc59dd9c0e7ee9bb75f4d625a16723/81490918997.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nht9ntnf1djsgqeb5khj9icv75/dizaboguze.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4a172745cdf0aa25d246142145939ac6/dejopuxusobenexasisivu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/i0micmuvm2mt513h1qf4eheuc5/wimolufuvuxoledumaratujox.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4513d32af78844f721908025c262156c/rujuwibonenomirikenirago.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985dc2e335---63429481752.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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 16608 bytes
SHA-256: 92cae153cf92d8b614d02febf115fbb2cc5412e514aaae8a1c0265fa9308d52e
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 11476 bytes
SHA-256: 7b730c8994c5ef8bda64dfc5289128f0a18f0e664c59021b1a0fd8fba98c47c8
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1