Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eefe2612dbefac9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 19:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09d93a39f2989cff8b0fb32dc4de93ee SHA-1: 387a573937d0981def8f650fc8f1f970b2db62bc SHA-256: 3eefe2612dbefac934c64d5dd4130d5477360ec49d2b1b0fb33b69c06971b38b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to host malicious files or redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf89846946---37624106980.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/93452973568.pdf
    • http://cosmikkino.ru/sadm_files/luvubadepesazipeb.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/buvexilufanasukofinewup.pdf
    • http://gcsiva.com/files/userfiles/file/84207518768.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e6ba97d3---89438743026.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147207fc0e5d---73663663437.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/33530191777.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/95509304186.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3e34c9509f96a71f6a1e319a8a5ca2/tarone.pdf
    • http://abwgulfport.com/uploads/files/69495185619.pdf
    • http://rkmaster.ru/uploads/files/8433860059.pdf
    • http://usa-ex.com/images/blog/file/vagunolupopamojudafemu.pdf
    • http://buyo-g.net/userfiles/file/bipirupikazixuvevo.pdf
    • https://highlander-inn.com/assets/userfiles/files/fitatoniredesubadogi.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/duzetuk.pdf
    • http://tatooazh.ru/files/files/zagosivoretutixi.pdf
    • http://wirheiraten.de/images/file/15891135018.pdf
    • http://abbeytraining.net/userfiles/file/53155049648.pdf
    • http://atel-j.nl/uploads/files/gutaberolitab.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/segojozitixanefuwukafasel.pdf
    • http://radis-rrl.ru/userfiles/image/74941947571.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/tizulodamaveropa.pdf
    • http://maginsaatmetal.com/resimlerfiles/jibegedim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=frp+google+bypass+tool
    • 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_off0000b3a9.bin
60c23ff0c7012bff70e9d2e3100713b2371834f2f2e607f34587d1340ad310fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 10464 bytes
font_01_sfnt_off0000cb5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 16792 bytes
font_02_sfnt_off0000e36e.bin
5d624202db005ec02cb34abcfe9199ba89bff0e6e8aa5c16b69fb2223ab6c540
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 15548 bytes