Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4d3b5db990a076…

MALICIOUS

PDF

96.4 KB Created: 2021-06-27 08:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba45c1ebb313702bea0335b6a3685b33 SHA-1: d6ca0199b192993a13497fb9cc0d4a5113f68544 SHA-256: 1e4d3b5db990a076c7ac9761228564d0376f6f2fbde912e1bf66b61ec60c5ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://queure.ru/uplcv?utm_term=an+anthology+of+commonwealth+poetry+pdf
    • https://alshamiltrading.com/alshamilfiles/file/timaximufoboriguna.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e9da44d2---kavunefanigewegurapinoz.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc802b6c35---7175031972.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f9fe9eb4---lijeb.pdf
    • http://coreaad.com/DreamDataUpload/file/80834152981.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qb9p8ngvah0q47efue10qr432m/96348178285.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af9288109---46991172112.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/9314915692.pdf
    • https://batikatravels.com/userfiles/file/lumomuxikanofesinujedot.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/iigfssddb2mea1lva0u5i2phsk/dobonunanoravegadejaxufib.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91ed8b2bd---vukezokiwelozo.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9062470856---82729625109.pdf
    • https://espiber.cl/images/uploadedimages/file/10225993571.pdf
    • http://ahsaipu.com/v15/Upload/file/202143013127798.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/3b4d9cc44bc6ca32b7c6862a9d134bd0/8333354903.pdf
    • https://sasalidayanisma.org/uploads/file/68986233981.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678e43a262---87703436877.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c90e30d1b7d---nesujobekiluf.pdf
    • http://krevue.cz/UserFiles/File/fedokav.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289c8f20ed---gimejela.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011322.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 16792 bytes
font_01_sfnt_off00012b39.bin
f0ff5edef15eb6a290f716b02255d9a578b04fde59afc59beeab5ad9e0387e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 10988 bytes
font_02_sfnt_off0001447a.bin
66fee9c0769562be033f0ec5ba5d64653f0074c0a6e26de4f6e6d2609902449f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 18384 bytes