Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac875c5bbdacb8db…

MALICIOUS

PDF

88.5 KB Created: 2021-07-17 05:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5eb0924b110658194798819cc9bb42 SHA-1: 41b3a08728df0def46b00a069a4fc4b370e027be SHA-256: ac875c5bbdacb8dbd320b3559d342212be23864a667eee626c41cdd81a4d7e4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://mobile-translator.eu/app/webroot/media/files/voxuworowanurazufakibaroj.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/aa4acc2a411a43612aa199ec795b8c83/76140565576.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a953f2ecbee---gukuvodepobizerizukibe.pdf
    • http://agataklimowska.pl/userfiles/file/wavalerexerejejaxebu.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe0229e63d---36369446340.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea91cd358---26554376750.pdf
    • http://animationcoach.com/userfiles/file/21272039186.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070996bf1ea6---borojitifaku.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f20227970---4543187512.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d48ce67e---dotujor.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a678aec4756---7822483284.pdf
    • https://cissud.eu/uploads/ck_editor/files/54218418454.pdf
    • http://icltindia.in/userfiles/file/pawerenizuxebibapevub.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2c64d810---96504480875.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446ee3e1c---8589799001.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/44c6a7beeec11b1e9de5866800dd0784/limojegunimupeve.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iia5g32va25qqem97mu7i40uci/9909659508.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8mq9pn79rdpust1qege8fvshli/88081685669.pdf
    • http://unipsyclinic.com/userfiles/file/20210517045341.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c999661512b---83670335235.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/38a16f46c6b1b9d7981bf27459bc5289/1766331899.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a78552f5f0d76d7eb24830ee42731f0a/29571230881.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/texinaki.pdf
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4fe462cc---94887996133.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=one+dinar+in+indian+rupees
    • 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_off0000f726.bin
c376957fe0db5874364bd8fe9db925b0e57167a2c2036454cfe3e550ff39b373
pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 10248 bytes
font_01_sfnt_off00010e4c.bin
a104ed558efaf37b2f0d4434f4f5ce3bc859df3bc1ea24efb38f9791d7f24f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 17564 bytes
font_02_sfnt_off00013cb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 16792 bytes