Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d4e69a3c9960e0…

MALICIOUS

PDF

78.9 KB Created: 2021-06-28 07:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff32aa4b1a73de768f7d7792972f0573 SHA-1: 8ff658cbc74859d3394da50b21359c5839051131 SHA-256: 59d4e69a3c9960e0f975bef9c0b3797f02006dcaf07eaeb49897ddbb6fa48069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4f9523a6bc54b07c9e209ea643f82ed/beboxejuf.pdf
    • https://menlopark.com/wysiwygfiles/file/linomobigalitovuvupoz.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7708e2015d4fc2b9d2874990ce59c666/ronavujezaluremujowo.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832a816eba8---61943230472.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tk4uiq8hhr93aqdrput5qpm96l/dugubad.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c615d7233---lazugawexetejoluxulowolux.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fae6e6ae---65769759865.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ggjg18737sevo2u6ksqunhj241/54550751567.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/88072c8b79daeeb7d3e492764a2eecd5/52618473777.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/07be7abe94697eeea41fd380ba10e3e5/fugawuxubowo.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/iklal4l7nb81qm3hsqjvrn3au0/60754601367.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qcajuguasdq57ihgobmo2fkdo/32287118132.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0240decfa677d0cf5a362b2fe5313b8a/sadojamam.pdf
    • http://tamker.hu/userfiles/file/zubovut.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa24bd5d55---19496765449.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210624061817.pdf
    • http://beastyenergy.com/userfiles/file/33654545179.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ffad02b3---24420978514.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20c4a4797---34328694400.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d7c7fbb305cbba54f39051826ffcc54/33847007537.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dip4kjqiopmbsg6i3100ibofrc/waxireporeterowet.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc40532ded---14287291960.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=form+1040+sr+for+2020+tax+year
    • 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_off0000d2b7.bin
c731a6663a1573d69aff8808012098f212602e43bb50844b90381700f9f0e2a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 10696 bytes
font_01_sfnt_off0000eb7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 16792 bytes
font_02_sfnt_off00010390.bin
d259a642a7d0657ab693154c2e2fdbda72736d12544776b7aa8ecb11462b5b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 16448 bytes