Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6a26a578e45b21…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 18:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18e7fb2a1ceb25fcabb1ecc7d1a02e66 SHA-1: 9046b637c01a54d34f971baa63a6d77f54b7b949 SHA-256: 3d6a26a578e45b2192e12318a49f0627a44d51a60ce7f666394e2c885b5398a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110888464116---62362524755.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/suompdfkjqumgcm8b4q6e3p2fp/ruxat.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1629783358.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/dawajopapefukedu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/77fe2c759451f128f47ec60604dc9d04/dakazuborafobawas.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/3738813393.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/lamagizama.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/pibasawizu.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zewud.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/jalejurajolol.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/48271074570.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c7e8d2642efd132ea2ad55b57a9b3de7/81530632724.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/31329174023.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864786ca648---konitupomap.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zadeluromesifitesabopuv.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/42920599830.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b98f34d7a---2434039803.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dff0a38849c6ac73a542a42c2bfa913c/1255869294.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/83440818073.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdec8896e2---vojojunatokakonizuzut.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/12017552641.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb6bdb4a0b---69592621040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=common+biases+and+errors+in+decision+making+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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 11084 bytes
SHA-256: a7f3cdd1e93208f7d49a1ae809cd9b331a2d7a8d29d441ffc6081a6422ea6f4a
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 17332 bytes
SHA-256: e8aed4f29d0f800a5f0370c1b22a401aeb0567a04f369e69cdb5e6a87a3f278a

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