Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de578d0de952111…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 02:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 228f9b9c46120fc8c481f72955dc4d65 SHA-1: 454934ed42d214d385d5ffb2cb1819a55cb60219 SHA-256: 9de578d0de952111b290ddde82f94fb86279f8575aef5d110ac3f431af2ba614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/81deovu161u2bl4adtu0kbv7om/10247488947.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/50a2235082ca4e31fc1cc2603cd28d89/18902428433.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078084249c28---sixuregiditadanozixi.pdf
    • http://alnadaoil.com/userfiles/file/xomekesotovu.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/rojanezonawutilola.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/jogijepojafamubamuve.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c63196336---xawopejikujarawoku.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61330ad1e5---dufijewiteberifelo.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc4b7ac63---97664022816.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1999222ba3---55765039321.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b002496a---38039508811.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/r5u66imk5r674bn4q2ca7n911v/maxofazosejumenu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52bc4f1070---tonajujidolixu.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n0qr3s6qfrcskeqtq5st70psnq/14517924621.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mio87t16p391easkoafnhj25tq/81861715917.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/44216295168.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ecd86be9---42144812151.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d75d2ca4d---58110516211.pdf
    • http://mega.kz/media/upload/files/tinojizojafesed.pdf
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210618083108.pdf
    • http://www.allatpatikapecs.hu/images/file/tokezojububuzeped.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a5bbbcaa---32629549141.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=physical+development+2+to+3+years
    • 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_off0000ecb0.bin
7fde98eddf61bf9f0280d769c25525a027efa0fa1d0b9155c21f08419264c11e
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 11252 bytes
font_01_sfnt_off00010703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16792 bytes
font_02_sfnt_off00011f15.bin
a31d29a794d0168c3a2d86432af3e4426ab21373baedcb61e8157d4a4ea578da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 17168 bytes