Malicious PDF — malware analysis report

Static analysis result for SHA-256 3308fd5a82ff50ec…

MALICIOUS

PDF

75.4 KB Created: 2021-07-18 19:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 544b5f47fa505fb0ade59e58db2fcd14 SHA-1: 844f1f86fe0327a58697df22b17efe6daf5b32d4 SHA-256: 3308fd5a82ff50ecb4c141ede1c57c4c2ad69dc7c74832aef54509e505f27b71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e8e726fc---rovaxibexagederuxevagile.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1ecdef5043ab9604255c32ce31010d2c/2447999287.pdfIn PDF document text
    • http://446888.top/userfiles/file/garulujes.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba46cb6ce3---kofomaseb.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/83088851019.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/65737558970.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/danim.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ej12mn4nm868a95utj854le7p3/74552304655.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tulagumipimasigewimew.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/detefexikosuvopaxokobe.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/roxab.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/pexuwasenepobafenoxek.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6577ed2673433f806000eeddf49e39fb/22972213031.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/53d56ffb973397a1578897ccb692917a/dolipedixoximi.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021513151305747.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/tunifolawe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ae1aebb---fulejazumikatikarodudizom.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/92382606716.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6ir4tk5s6o49k4hmqv15agcp8b/52117920745.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/82378103646.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4966d6d7---xuzepubutazukosowakorofo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/542559d8d8e7a812ddb963016effe718/topagamitow.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/5a0d1a5260b4b7855f3ce3adc6c5ff1e/82492506803.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1j54kmeqfbhulg51radcvmnk16/42203839419.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/79141959161.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/juvuzeviziwosamefunin.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160987d4ae693d---nevunitemuzora.pdfIn PDF document text
    • https://press-centr.com/images/file/wikufibete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ff+greater+china+fundPDF 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_off0000c16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16A 10496 bytes
SHA-256: 28d088f75bc4d2cbd1b0a1d43947a874c02c8cd38fd4e745d1d6912a84b6ad4a
font_01_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 18008 bytes
SHA-256: 364ea4a31593ebd6f069cd76c561bbfc1cf6d24f672626659c0c9785e0df5432