Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c6446f68978c56…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 18:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ca856892fd75d8d8c04a0c5a56a6352 SHA-1: 40fc6cc26f0dd26053a46ef68fb8392ec43e0121 SHA-256: f1c6446f68978c567149012b75a8ee560b0fdbef0f418ecab67521dc1052cb6f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3659940197039ec9490da2011c31ce6f/joxupifamunakafeki.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e04aaad3---gamef.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/08-30-15-35-41-37.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1292c4da086100f05c9eed3b0f9bc62c/sepikix.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/24a358d43a804da73079862705afe86c/zasonotarufipuxemezonalav.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60FB287F2632A.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tq91981tdbuaefn4autei04sa1/nezojomexiwilafaxivoragej.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/podesafogeziraxefuxomeje.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bed87d9da---48597635286.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/nusiwefogifugadekepopinot.pdfIn PDF document text
    • http://recrute.fr/files/files/66382985836.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032009455618.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/magiditoj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4a717215---63290362580.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/tuzedezaken.pdfIn PDF document text
    • http://mfcpavpos.ru/file/38527855646.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lorugere.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/maxojagikux.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b39f7d065bf23de685a983b24b380c12/rovijizize.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/a9e9d8114136dfbc82d4a13c7b93951a/mifepixiwaguwazokidemuf.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/61098651857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fundamental+quantities+and+their+units+and+symbols+pdfPDF link annotation
    • 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_off0000b9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 11240 bytes
SHA-256: f9a171b163065b7b515a427a632b957211c71dcd518ada6eb1d0cd671a427fb5
font_02_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16676 bytes
SHA-256: 4e64eb9cc538e6703c52c248b641a01224cb82909362383bdbe6fde4dc98f23e

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