Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ebc2a807c67989…

MALICIOUS

PDF

87.4 KB Created: 2021-09-14 16:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dec828b94555f5f5ba078f6e399be4e SHA-1: d18d85f8166a33df385046cf360d1a7ed372bca0 SHA-256: b2ebc2a807c679895783efb637cf7452caadcf70eeb6d6f20c2def2ffcf454fd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document functions as a link farm, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the presence of multiple external links and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=mood+of+the+poem+the+road+not+taken PDF link annotation
    • https://marblobaths.com/app/webroot/img/files/virepudokenazakupifarulop.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/52571730571.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/35422451844.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613372c47b4a4---37245584639.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/68538316820.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/98823994265.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134765c4ddb9---mazukuwisetuwojefi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/dazafupexidogu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/vunekimemi.pdfPDF link annotation
    • http://nextgenship.net/upload/file/20210831163044993028.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/38310358645.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/1944281475.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/likisijifiwaxiw.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/55c40vu3uhbb8ao1f57j98qomk/27241884143.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0892429001631224030.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/relobuwojuvuzufogane.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/foviribenasimavejesin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386bfa33a2e---15715033994.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/84539179380.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/44624629235.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/66503224361.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/53a4b607cd6cd27296f3518b09ff2c51/mojuvudekidasavagex.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/bokekefakonomilevobidab.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_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 18464 bytes
SHA-256: f901ff304854b1fbe802a884b26aa84ee34ed6f9176a51e04378193cd2f4647a
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 10540 bytes
SHA-256: 03610220bb4fe2c37def1dd9a18853ae182835360016f4510a9e8d383d1a6922

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