Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53abbe6607e80b8…

MALICIOUS

PDF

88.0 KB Created: 2021-07-10 12:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59e2bd37a8ee4e993b5d7e4f8b94c00a SHA-1: 060347151ff4e79f95bb1c3b04fc5e6ca73f3c53 SHA-256: b53abbe6607e80b87b9aca74a9433d00f1f61cb83b46ec17cac46ff5a1f1e32e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. These links likely serve as a link farm to obscure the ultimate destination, which is characteristic of phishing or malware distribution campaigns. No scripts were extracted, but the structure suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609922d5934ef---23629748762.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fbdaa2d3---37523380402.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/e4uqdspc1hrm8qp6pda1pl5hg1/77792676797.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/42cbfb80f420437f33aedbc7903b1ae0/texuludaniv.pdf
    • https://okazdedziecko.pl/_files/Media/file/welekiwakedexofululadabe.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccd8cb70b---rofurodilinebipoke.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/695365779bbd32e65b11a05fef7e7c04/guxalexedut.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160852ea094535---37464946456.pdf
    • https://cortemadera.com/wysiwygfiles/file/51383762989.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nqkirokt6o144bvjk458ir6ukc/76870002200.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7143b221d---5221378771.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/tolukoferofeni.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ec1c6a64db25909f875901eda31e1467/lokopagifavit.pdf
    • http://goodwill.pl/userfiles/file/35992394121.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hnpq47jtl49j7nvfc93p8plmh1/70472153371.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609613ec20d58---wuluvixuxupoxajafuk.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6c4tmm2vm56ovpnkbs1p8ngav1/23921240036.pdf
    • http://0-50.ru/userfiles/file/wokeviruvij.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/gopelidokunutugore.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2711e7d0a94c2ce607e513c2cbc32413/vabakatav.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/92488933328.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2794042833---96965176575.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thank+you+lord+thank+you+jesus
    • 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_off0000f604.bin
a6728d25d5a668989408fe569d26ba3db8e813b54f250cb03d551a0895ebbde5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 17076 bytes
font_01_sfnt_off0001227c.bin
fd69b9c027435d5ba90fe642651eedb64bb8585730d3db4ff58749a142618e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10652 bytes
font_02_sfnt_off00013ae7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE7 16792 bytes