Malicious PDF — malware analysis report

Static analysis result for SHA-256 361ffe77af0cd592…

MALICIOUS

PDF

81.3 KB Created: 2021-07-10 07:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e99eeefec663edb4cd3049f42e05f363 SHA-1: f44d86ae9eda0649e0bd9bf740847cb600c80668 SHA-256: 361ffe77af0cd5928aa38a6bd7c60496c6d284d3b56757bc0ff9eb2ba0f49712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various PDF files hosted on compromised websites, likely as a lure for downloading further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://elementsgogreen.com/userfiles/file/43852578913.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf10306365---zazodedisodef.pdf
    • http://ahcxdq.com/uploads/file/040451547686.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0021b886d5---23947552268.pdf
    • http://vigova.vn/Images_upload/files/72066787801.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f47b264e143c665bbaff800311c3e18a/lonurer.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/dikuvisomezufulezo.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/373e8163eb8b210a33578b55046c148b/bojig.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083995cc13f9---zajenizozoke.pdf
    • http://com123.vn/uploads/file/sufobofubanij.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a56f8e040---pitelezexunekekexovufo.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29e078fe7---17256823875.pdf
    • https://aedwea.com/upload/foto/madulokagoxaw.pdf
    • https://ksboutlet.com/file/files/dejilazajupozo.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b12c88229---62245290534.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/fasomilojiwesixirodasu.pdf
    • https://ladangmimpi.com/contents//files/22718327712.pdf
    • http://ehomeforeclosure.org/images/file/37805879777.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b213648ead085421eb3ad19e5227f481/75886063688.pdf
    • http://scamps.biz/userfiles/file/58934992946.pdf
    • http://myucmas.com/userfiles/file/ratazatodifafuvelibiva.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/85271619187.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/342svsmtr8c933415vi0149742/30522140685.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/dutexilanosegeteruwusoke.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89798e3fa1---tetowokeribiti.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1fdbd4ea59110824f2a4956765c3ffe6/dijev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+word+file+to+pdf+converter+software+download
    • 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_off0000d990.bin
64fb45def783fb6e9cd00ede20825542420196cb49488f775e200d57e2b818ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10744 bytes
font_01_sfnt_off0000f26a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes
font_02_sfnt_off00010a7c.bin
1987d0a265f36882128c001930cf6ed837a5fe8dabf133d9fc1eb8f058462e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 17060 bytes