Malicious PDF — malware analysis report

Static analysis result for SHA-256 a760d378ef2fcd4a…

MALICIOUS

PDF

84.5 KB Created: 2021-08-02 03:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca2820b58fc977ecab9d28aeb5a28f12 SHA-1: b93752def9cd6385f2e8ccbacd917ad34bedb9b6 SHA-256: a760d378ef2fcd4a5b81ed6659e08e404894dcb533eb926ca1eb5caabae04b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attack pattern that leverages external resources for payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7741

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://goddesshair.net/upload/users/files/vopisadiz.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/wipojogarinopoxoboxexaxom.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/jugifofu.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/55817784172.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/6708558469.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/rewizipobekuxurareku.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608722a7298c8---tapabutirirarasodunizefe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767905c1f75---dipugiteropigafu.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/derabemodesolova.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4b0571edf78e5b00fbb03d630be73b6b/76657639070.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8624bdaa79---mifipafawajoketisimobi.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jelorofu.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/90784769638.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077f610905ac---31110936247.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/gisititozuzebibodori.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/bdcfc120a47562f0a222bcce6187fec3/14151259611.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/34599319799.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/46994mcmcvf8bp6g5do8p3jsj4/debaxasujosafirafosemeru.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607929980565b---moviruguvedew.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc64ed1621---kirijasiva.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/78403436799.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/keregixitifubijugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manual+de+hidr%C3%A1ulica+azevedo+netto+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 19744 bytes
SHA-256: 54f79c33834106849f2438a7c2487d2c872d38df4a0160f7d42c15dcb891270a
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 10948 bytes
SHA-256: 8f08f4066ebd07bd6b709139df2813b52acfc8eb55e88efdee28cc9bf21d34f0