Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a9a38ad7b24447…

MALICIOUS

PDF

102.9 KB Created: 2021-09-07 06:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bb56f091e3d3e3f7c5103773eaba534 SHA-1: 74a6199a89b146db382901f955920032be5e5db4 SHA-256: 75a9a38ad7b2444783103a67d177dcf1b385135bc20b456b9f5232461420071e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=mountain+ranges+map+pdf PDF link annotation
    • http://chinalabware.net/d/files/9341356004.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9d1490d089deda8f3b5581118c398167/91875552067.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/duguwumoku.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd4b0eb292---49124496035.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81d37c63a---birogowifow.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b31f0089d3---41135034463.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c80ca386---67435730547.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/sunajigo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/lebikak.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/jezete.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3eaaf76356b11790c4ab5de2e2f51805/86164629965.pdfIn PDF document text
    • https://micsys.in/userfiles/file/xorebubevokasumetubokiwuz.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/95754149593.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b15e21ab57f4798a9d390a9e2bd4da57/88116092655.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/96322441051.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/wamesi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e2ab75b7---73213423646.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/49024862803.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/temumuma.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/14064083500.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160893b31e3e38---julosunofonemununuweri.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160972d3bb9953---78705234788.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021726743345233.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_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 20616 bytes
SHA-256: 468aa95de064a2c164e4dc603778971dd38563d964077d5d75985ae3939500c9
font_01_sfnt_off00015c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17479 10888 bytes
SHA-256: caad21ec666bb9697b4d9b7cd6ebb498b29eb052f38a10c8f3b42ee20e9f394f

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