Malicious PDF — malware analysis report

Static analysis result for SHA-256 33982f934c0b3a68…

MALICIOUS

PDF

69.6 KB Created: 2021-08-15 11:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2603b8726f6534c8c2d73bb3fcdbd42f SHA-1: 34f89ffefec8320711b34661dbcf008ca6404178 SHA-256: 33982f934c0b3a682e044650bcaf319a92bd74fe3b20624dd18a65dd71b48347
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or obfuscates the malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152c8e4adb5---wakuvofimiduwow.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bdhmp6f61940ha84etmnmqb4g0/nirivuxigugirax.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/tatofutazuwofi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/25725974008.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/wusuri.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26730a60a0---81916481767.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210620_3564659F49FA5301.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/82426673760.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zubaviriniwajunudak.pdfIn PDF document text
    • http://merwepizza.com/upload/file/69167973700.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad28347821---65952130313.pdfPDF link annotation
    • https://hostingyuvasi.com/calisma2/files/uploads/pamosiderojisubam.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3da3a74e57512b40219a6ae68275ecd3/61956685872.pdfIn PDF document text
    • https://arerp.kr/data/file///dodifagako.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/puluvagemulu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/f4960572591bd9082900595facb7a2b1/42965684470.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/12265818887.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c2300480---jofipoderawozasobibugane.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/pibofemikuja.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7e562216---voroxosovavefaduv.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c65d097e0---82137632806.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/12c9123b7885b7452d7c6e1cc2179b33/33433958483.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/mijigese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=o+comunista+exposto+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 10992 bytes
SHA-256: fd312afbd24fe93ea16f43fefb99c0c8840a5c7ce445636ff28e0c29f2d4c0ce
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 18580 bytes
SHA-256: 728d4f6bd10af4b2553deb13b5fb8cb885e7eb6cbb92af3d4f63f274a5518871