Malicious PDF — malware analysis report

Static analysis result for SHA-256 033f3912e88fc4e5…

MALICIOUS

PDF

92.6 KB Created: 2021-09-04 02:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a573da4c53f25a69d43b523105f87263 SHA-1: 7b5111d7f3eb3276421a152ae03070cedf9509dc SHA-256: 033f3912e88fc4e51c025427f6c3fd76fe410f3b62191dcde141195b43c3c50c
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=aube+th232+thermostat+for+electric+underfloor+heating+manual PDF link annotation
    • http://ibrahimalsada.com/pics/file/83864869998.pdfIn PDF document text
    • http://esistore.be/userfiles/file/suradep.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4496c75d---kisanuzenilarejanu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab66a33f4---sasoradovutejamagiwusu.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/33271503588.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ulivhnfuobeu9qk595b0ajk3b0/28012971241.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608409c186c8c---poradosetoduzezikozuj.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/8ddc9c811d34fbcfcf5932c8610d6ffc/xebowokuvulozuvexaxi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54f1bd6409ad0976772f1fcb0a93f56c/28725771197.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/22752674796.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///64904059118.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093482f0b1d2---61226503542.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058c299b15a---31206822192.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/12533706229.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/vimumu.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/rolux.pdfIn PDF document text
    • https://asi-filter.pl/files/file/fularij.pdfIn PDF document text
    • http://minhanh.com/files/81516716178.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/daporavanususod.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/13915263782.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/tajagiwuremuve.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/36074024014.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a062726abaf---nosonelowotadevalasu.pdfIn PDF document text
    • 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_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 18188 bytes
SHA-256: e867c2fe976fca86c1c2f471732b46c936c820243d85cb9f939576ec455eafc5
font_01_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 11436 bytes
SHA-256: f6c73ea5e38db223fcf53b739e498df1c91019f6a80590851163557924e63bb1
font_02_sfnt_off00014c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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