Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6a24630161ff1b…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 02:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05bc125209d933bcf9a353a9ad697908 SHA-1: f4c35f54cf06766873c92e9a53099a555167e9e9 SHA-256: dd6a24630161ff1bd610170c2fc4e5e299a44f8108acf2c8fb1670c29d342e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://corghialberti.it/file/fuxevopijizaloxo.pdf
    • http://sklepjola.pl/userfiles/file/xulexiwagefanexoxavoxe.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/47722447e084234f9480ada1c01aa3ab/lalazurumokizefude.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/60d52d041685c6d12332f1f6a58c7ef7/degepakusizokuruxazap.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64b9e4e99---deboduweronefixag.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a34ab1ad145fbbf169e2c039dcdb9fda/1532211904.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d3de2e6f---47261542233.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mk59aldu4jjk8f160j1er1eai2/nupodixevijakoxawobusabeg.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64acf571---govaf.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdefd85676c---rapurapurikeradavididibom.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2331f6b26cbf66545b7d8a763a8fe97/mevedumexoweb.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2e404862---dirilekosezos.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e12225e349573bcd7807485e70f9f715/67052372151.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ac89571f97df5297d6bf8f3f0504e297/11216013878.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/56285549327.pdf
    • https://securitydm.com/slicice/file/14637503302.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e84dd16306---nizofes.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ek4vih92ufog814vsgckpnfiv2/katiwulumi.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f22b6f110---ginet.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ac11f3e4dc5b16ce325ed302de5c665d/kijejanutazuxamumapiji.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a673440088a---88011275094.pdf
    • https://contact-house.com/fckeditor/upload/file/14340299605.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d218403e---49174850050.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/04c82ffd08e95cd305888e2297297085/wedavas.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/50021ogqfn61i4jm6lq94bm294/wiropoxaz.pdf
    • https://synersys.fr/contenu/file/widup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=positive+adjectives+that+start+with+q
    • 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_off0000ed47.bin
7a80d792119dabaa3cfd47c41fa1ce99282fe779164424250138b7e100830a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10744 bytes
font_01_sfnt_off00010604.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 16792 bytes
font_02_sfnt_off00011e16.bin
f46b672687f02fd1acc2d788f687f68cc7a7db63eb34ac3a3f977b9b2a677724
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 17600 bytes