Malicious PDF — malware analysis report

Static analysis result for SHA-256 6898f2d6e7f7af9b…

MALICIOUS

PDF

92.9 KB Created: 2021-09-16 10:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 797c7b5034488e2f9e24f3e77bded14f SHA-1: 0cdad135b9d13bbf9f196b08851183e174f0975c SHA-256: 6898f2d6e7f7af9bd0039dfdfe129a1221bbff93bcddfdfdf542fa92a518a126
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable domains, likely to facilitate the download of a password-protected archive. This tactic is commonly used to bypass security filters by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=como+reinstalar+android+en+una+tablet PDF link annotation
    • https://ecohort.com/userfiles/files/megepakivefobubepojonub.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/18809664364.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/88899579079.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46507829168.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/warebozariwiv.pdfIn PDF document text
    • http://debten.net/UserFiles/File/70138369858.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/35190114633.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/62784121395.pdfIn PDF document text
    • http://mitrasuksesku.com/userfiles/file/34081470956.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/76651492639.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/rulimutuzijuvugi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa34f0174---kaguw.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vitomesukumixepi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/14e605f00a85cddfe2b079d551341e36/rogitazub.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/lofunitobinetutezeketuro.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/39153124136.pdfIn PDF document text
    • http://livestocktool.com/d/files/bozikujebosunosesedivofi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb1676636d1a26bc482b7e22cfc446a7/zurimuwugogemoxe.pdfIn PDF document text
    • https://teamcode.net/upload/files/61738272878.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2f7db809---93636610101.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/72731672127.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/20527374772.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/76056177426.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/xedivedobakulefuvolikatun.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/folagisav.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_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 18984 bytes
SHA-256: 3e06a6854b3387bff15bf1a1fa6993d52df35dc4e1bf25e8582d257432accf2a
font_01_sfnt_off0001350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D25 10680 bytes
SHA-256: 78da3af78c2c805ff152d6f36f435588f4ac3e6852d1b9194d15f6567293eae0

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