Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf74f9716b484f5a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 04:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb663944622cc9239e9bfc9268178a4 SHA-1: 1579f0d2b6b86d915a6655f067d2bb31f5af7b4f SHA-256: bf74f9716b484f5aef6938e083d0d14268088a25a0eb363f9138e0172bfc9a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b8994fdf---sipudok.pdf
    • https://nepalaviationmuseum.com/userfiles/files/zepexuwivagunemozok.pdf
    • https://starbox.fr/img/files/guzesupetugaz.pdf
    • http://aarogyamedico.com/userfiles/file/rimaw.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/2pv69bl9f4gdj4rgnohlh9muhs/7302817884.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/xijokomad.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80d5d7f1c---34781326831.pdf
    • http://originalcheck.it/public/img_admin/file///beduwefi.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/crdtgm8mr8r1ob3cf6vd7ivp8v/46085908945.pdf
    • http://jatyn.cn/upfiles/202105/file/1620384663.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856c01edab3---66021177997.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/slil6e10li2a2733n07u7umm1r/20621294939.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf7f8f9bd---jilim.pdf
    • https://ikima.fr/uploads/file/2188201035.pdf
    • http://apexnepaltravel.com/userfiles/file/biserogoxojob.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8e2a835eda7392179598ee649bb40cb4/wasazeso.pdf
    • https://clickkedai.com/userfiles/file/rigazila.pdf
    • https://zlatartopalovic.rs//files/bopidulufidewiwisevexo.pdf
    • http://rustproofingottawa.com/userfiles/file/lilavilixixedunutuzumuris.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b433ac8bc39---kiwugunijaxuvaradafitug.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7df8de31e539179475a1541a5c7bf4bd/xisolenakagalumafowok.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/eba62c2696a35b57d2dcbbad0a4a7cca/gozirebotelopexelov.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e6f1737dc9482fb7fa2e20c491de5878/pefajafupu.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c72d5b43969---ruwizomelogutewug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=electronic+devices+and+circuits+salivahanan+pdf+free+download
    • 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_off0000e7dd.bin
d76bc6fb9c434857986112781d79ffea95bd7ceb028e0f9e50a3eb12282326ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 18240 bytes
font_01_sfnt_off000117ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 16792 bytes
font_02_sfnt_off00012fd1.bin
6c9062f3c83095a18e995ea602b23a54b810a9c953f94aaff0b22a24db3c471f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 10952 bytes