Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf2edf8538976d0…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 09:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e998be3b3294ce776b6c5a40e2ea4928 SHA-1: 46b8d40455a12f460a93e49f5dfebd452674fce2 SHA-256: edf2edf8538976d0eaad72afd86ca307f36eb4ca1b40d62015ab4e70431ba6e4
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external links indicates an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=the+conceptual+framework+of+financial+reporting
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a985b1b47200cc3c9006ea488c7dec36/71632011884.pdf
    • https://service-panev.com/userfiles/ruxakarigomaju.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p9kqek8vjcmkk411ma2dfbtknq/namesifomasunepigonulupoz.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3538c4d977331b8d859fd9449597fc9b/7420151202.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ikv1s74u6rf5f2p5kue0tq11tg/sanepore.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_44B4FE6AF32342F0.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089603a184c9---rowozoritevunekabeze.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d74c4cf38d2---fexafufatitogekeb.pdf
    • https://alnahamgroup.com/userfiles/file/14058347901.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0b2f34a4eff8a5aed78333cf6bba711f/tulilazudabuf.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21e9f56030---timusewuxufare.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca76ebd1a---femoturimugu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef1d5c34d---18436680373.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cdvgihfb6laoe55s50sg31sts3/giwinevizeloxoke.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9524442965a882385a849d2b010ceabc/sosuji.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vpp2183tk9b0dfpcb512sumfb3/49561838479.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b9081715---kegaviruseraj.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/sebidewowi.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bf6a66u6bcmoko1rtbe0tn70b2/saxilupaki.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087eada15d5a---19715316943.pdf
    • http://akcjonariusz.com/UserFiles/file/pejarurovulupaselilibi.pdf
    • http://ktcz.eu/files/files/pixeza.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ebf197bd---80342171811.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acd873eec30---64141226428.pdf
    • http://www.findvoters.com/userfiles/file/fedemoluzo.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/53bb645231aeb99e5863ca7f976712f6/kevezurufewedax.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077120528546---9114188627.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25a.bin
5c21f86a282247d8b96b91d696da2190a105ce5841642eb4e0ee91119e5462c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 11000 bytes
font_01_sfnt_off00010bc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16792 bytes
font_02_sfnt_off000123d9.bin
b73928cf782adc7f9c72831df6b05c940fe68c5693b6245c456c5f47f4821bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16588 bytes

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