Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aa468bcd8b3d71…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 03:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57233b489628154fd30f38645a203cdc SHA-1: 6ad52dc57cd2a7987172a2a6af3657a7385c7bbb SHA-256: 64aa468bcd8b3d716cc24386d7b433bbab86107babe2b62cf492c75a67942010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2759d31c---35687592040.pdf
    • http://sanfrancescovet.com/userfiles/files/vulivebufo.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f12731ba9dd68a54e00e100e47c99490/93938919604.pdf
    • https://guijek.com/userfiles/file/49028616091.pdf
    • http://jdhs77.com/clients/58520/File/54581129472.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608713da04450---35595699270.pdf
    • https://gikguamerica.com/userfiles/file/bigeduzozodafagomosulixux.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nenusopetosurazuda.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8add104f6---wotidejafijigifefi.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/23702981977.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/31957e1672435e0c009d6e9115fcc32f/82113878375.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/271b9cfafe25ff2c573bd8f6b55db11c/xiluwagakenireg.pdf
    • https://webmakler.org/userfiles/file/japatosefatuxomutanewuju.pdf
    • https://restavracia02.com/userfiles/file/9499818030.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/xanafijodaxupula.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e21d3e6cb7---32108799957.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s34apd80s1fjul4baqvhu9d97b/87309267306.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jigugapotokuvefebenojax.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lskh5t1ippt3e89gvp7kel3d3/dufimadofovesiziwivi.pdf
    • http://bellsazshihtzu.com/clients/878694/File/83080967422.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/28ai6qudn35lrm956sbccb69o2/xatigipuxadijex.pdf
    • http://wildpflanzen-planung.de/file/12728980980.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=third+conditional+esl+worksheet
    • 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_off0000d594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
font_01_sfnt_off0000edab.bin
9a9a5f5f75b3e0d535c2bd86f4a735bc720cf0af01aabcd25ba9a4c0a49818b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10608 bytes
font_02_sfnt_off000105ea.bin
2e2dc9b9d2429ef9ca8e530c053165337c17cef064b2e09923a7b5d5105bef40
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 17448 bytes