Malicious PDF — malware analysis report

Static analysis result for SHA-256 894a2807b57b2b2e…

MALICIOUS

PDF

82.2 KB Created: 2021-06-27 19:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9d6167b78aff8b4c82ebab8a34c5102 SHA-1: 732674d7012b4a2e2fe5fdddfbaff60673b225ef SHA-256: 894a2807b57b2b2e2367fc72a920f7ef63f40a774dd002d759526d64514c4364
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS upload directories, suggesting a distribution mechanism for malicious content. The PDF's structure and embedded links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2e8d4a1d---vufetenunotud.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1b2765e6---jikeruvop.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/xotubasewileku.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a29611876---volofa.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/60053017551.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f297006e8d---29931682281.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k485h7eig7c07jhek6mhl6q3p0/vujopewewitures.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607303070b33f---48907589642.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/15840157348.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/45213557236.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/27139846669.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb568d0743---bavuwuwibikinegur.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/85637084738.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160751cc009fa2---bofizevugefibas.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160835fcaa81bb---32262596478.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f4255c2ca0a9ff330fa7fbe9b4468bd0/veruvoniwesopol.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf838e12a---tavomimirofipoju.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83ccb086a---lilufote.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/db7dq7ib0rdtlt5o8nm2k7lkuj/gijaregelerazerim.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/zojidosunuva.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651ea24613---54474007823.pdfIn PDF document text
    • http://chinalabware.es/d/files/wobepojuwizida.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/gesemilebinegogeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=angular+tutorial+step+by+step+for+beginnersPDF 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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 10868 bytes
SHA-256: ca9f3099343f80acee35017a4e6886e4d2d85c31e70bddf00a577180d00c295c
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 17776 bytes
SHA-256: 406f309d3f7c39309cabdbb70605e6495715eda0f0a80050564bbba95aefc07e

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