Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f31398e864fbfe7…

MALICIOUS

PDF

93.6 KB Created: 2021-07-02 10:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c76bdfa9f352c8fcda7c866111288c63 SHA-1: d710251666ed93227884157314bb925ae55d30d4 SHA-256: 5f31398e864fbfe740b72f75afb88b01208f299f14a06ca465d6a027b2ad244f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings suggest a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7bb1e9d7---31476736158.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/03e808dced55bdbe3ef9dc0b671719e7/86022626332.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/14831183692.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df99583e4---77405660479.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b60a98748---bojeno.pdf
    • https://confetti-seasons.ru/upload/files/kofuwibutaledu.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160747b977f854---wubunulala.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cdh8bda8qdc9oid5avmhkuoe4e/jebipovegeb.pdf
    • https://rumputhijau.com/contents//files/sularexixijunemefuzu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/815a5d07c20f459721c293f6f99f600f/mofewew.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/61b3d428eb95d63d8f06d0bb68dbae25/88948072624.pdf
    • https://thefencedocumentary.com/adminfiles/file/jowasikaximobixida.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/accb57b567f9847d2a787d469e5d58c9/2011775319.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c0ab5d5d167daf18b43f996091433bf/vevabuwigupanobobid.pdf
    • http://firewheels.pe/userfiles/file/47195682354.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/9d3386e900f88f490b5cef0c6bdffeac/gomonoluleru.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/224ee1b1e62361bd8a0fc66226b21fc6/85583169925.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3taigqp2o71kficsc3ps9do369/minebesumologajesegozo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b7ab4ef858a4dbd283deba7aecd5889c/sakigofu.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9400142ac70e4930dc6405f8e411b218/tapewabususedapewito.pdf
    • http://sp3siemianowice.pl/userFiles/files/47880826538.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a99514a6615---vokazubetifewa.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1d955853---figalekeran.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/26991732161.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607386723d365---dalogepuvubiwub.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c15c45f729d4bede946d66cc19fb3964/lumiruxakesof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=into+the+unknown+frozen+chords
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c2.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16312 bytes
font_01_sfnt_off00010acd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 16792 bytes
font_02_sfnt_off000122e4.bin
7a31f78be12c419d261c3f2a008f5a5e02b987d33a729397ac5f4254853d50ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 10560 bytes
font_03_sfnt_off00013b09.bin
61968eeabef9ca31368af443ba1feb4506a0e8d584d981530b950779ebc5d1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B09 17368 bytes