Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9d7692fc8ee692…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 20:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b678d28f075a7b4e00f95da981d6eac9 SHA-1: c492e6d1c2dfef27c39540877f1f0734097b7518 SHA-256: 2d9d7692fc8ee69293266017de3376a4063040675ec6893500ef8c019ef58170
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains a link farm pointing to numerous URLs, many of which appear to be hosted on compromised CMS upload directories. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://amirafouad.com/uploaded_files/file/goganofusapulusewajupi.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5881ce888---87409187312.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/46099076215.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/83516507288.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/57868239777.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/930dc0f21a1c4aac3285f743644578ca/77460271293.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608520140a528---64092783103.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/bomojuzesifikexig.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ca28f312d1b0b01cab1ea4f62e5493d9/wefime.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/31121819379.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/vewemuvemo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090537dceb00---82645306333.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d1aa9893---47142825133.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/57415591023.pdfIn PDF document text
    • https://ikima.fr/uploads/file/widori.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/95489207624.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/79a7cbeb06d62b38f27feac5e4dde2fb/81634601827.pdfIn PDF document text
    • http://bodymason.com/user_uploads/files/92342026722.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160cee23c5dbc2---18102672237.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/2759071534.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4c27cf8f139bf92f2ebb116099146687/wovetozevuxovidid.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a36878e40346f6063c8dd15e388ed2d8/kekorepelos.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bofosigatarosuv.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081877a72391---72489770947.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202108190151555926.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/riguluxabomivebetoriponuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+making+of+a+scientist+question+answerPDF 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 11124 bytes
SHA-256: 3defcde61b1d48bd64e4fb07270f5852245cefca96c3df549ba1ebc79cab8d16
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16980 bytes
SHA-256: e1929d09bbe37b393e6664d3ecf70fd9045406c9f56757ba4b77e24a35e1844b