Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b23310d1d42d8e…

MALICIOUS

PDF

89.4 KB Created: 2021-07-02 12:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c343e0fe5651e56b42015e03de97077 SHA-1: a25e0521674b76eee04e690615c47dfb285b03ee SHA-256: d3b23310d1d42d8e577c8ee8df13f9f416d219e19528edb45844d312a3f5a0f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://emirates-offshore.com/uploads/image/file/79043388856.pdf
    • http://szkolka-wiercioch.pl/files/file/4829059010.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4st3di4jun335ogu39k3r45m8l/34505320488.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dde2d80b---11597301593.pdf
    • https://vieclamhanoi247.com/upload/files/rijudogukatifopirejek.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d1bd3251---86379690303.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9cd87fbd---11322028883.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e1e02d7141274872e336ccbc3961793f/pogiboxu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c2trhcc93i0tq6qpia17cgilp0/xemokiwabadifa.pdf
    • https://muacash.com/webroot/img/files/97165528613.pdf
    • https://ferropula.hr/files/jizoroluk.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/36f166ea21584f1bbd60abc80ac410cc/22461884038.pdf
    • http://nmglyxx.com/userfiles/file/kamuduborazanudamasak.pdf
    • http://karinameal.com/imgdish/files/57670457822.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/400e15ca259564d266d4a266f0a7b32f/gutaxudegigabozava.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e192e4895---ferelojuzeje.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc0a7ee1ef5cd7bf84a2cc7db35728ee/18030268395.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95e138816---zademo.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/793f41bb05e65ac15d7f520b5e999bf4/bipanifujifuburiwilizad.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/nlc562p5s5c5ceau5fj3jihqn2/65212764314.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/14c62357911601d13f0533cf719cb85f/29366197858.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c72f170f47c---jutilabeduwewevusivij.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34a33f086d6c307dcbbef453bf2438ba/38250768345.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=5th+maths+book+download
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5be9cf12dd4fb7ba88632167bbdd8f48/16506721754.pdf
    • 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_off0000fafc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16792 bytes
font_01_sfnt_off00011313.bin
887b3e5db286f06e626d14f3bb8786f6b97d993184fd16b6447da693acd7011f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 10544 bytes
font_02_sfnt_off00012b00.bin
35a8efed5102b52548bd35a2f31691885d61a473616a6c466ca694ab3606c584
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 17556 bytes