Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d81d2e6db05819…

MALICIOUS

PDF

78.0 KB Created: 2021-07-20 04:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01510035d51aab90ed47e4cbd05c02bf SHA-1: 6f2c31201a01eae9239a001ec7715e2d3364ab9e SHA-256: 07d81d2e6db05819b2480c0a31a3f1b173f45ff77b8aa787ea2b9b3cdc7d5b46
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://bachtungcompany.com/upload/files/32007069010.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/cc8012e219e65363a3860e8d5be121c7/95451969091.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/temamategudurabediku.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/sm6q8ou9k3nccar2gia9t694ou/lezijalam.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/20009804887.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac590866da7---46298620682.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/38606210835.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac226c1731f---23340881700.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c12c7c847---juzek.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e19c322d3---25639757988.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/87662775416.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/pawaxawidiwo.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/81083251800.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d295218cb3---ledamatidurikebum.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210620095638563.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160992aa86642e---89902515878.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xatukuribofufogit.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wiwotefimoxinefurosuw.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jodisugepadafesisubunabuv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0d0212eb---rituwutarasu.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/76238855215.pdfIn PDF document text
    • https://bloomeng.com/uploads/46121603976.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5f1d5d1b30ebce6f675baa30af4d4aa9/27496192261.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a4602259b55---zodixikaxubegel.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kekabi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/roguvo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508192752644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=1998+cadillac+deville+owners+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 16584 bytes
SHA-256: c7712fb8d8255e2ab7a87f9b54cdd81876386cf9bfcf8189602f5eaf49859c38
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 11264 bytes
SHA-256: 1cfd474b5b9a2f6ee3722b12b2ab1eff7ce007cbb440a3d92d0e74dee4e56ba9