Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b44ed04ff783ae1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 19:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f4f857daa013f253620e2b8193b6ae8 SHA-1: 60bc7da98e74f01103e8974f89ba8cd6903db07d SHA-256: 6b44ed04ff783ae13f46894ae46f8cc3659c767fd6d0a7b8bb0b2504824e2587
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely acting as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=vishal+chakra+movie+online+watch PDF link annotation
    • https://qkon.ca/images/file/moguvutamofagofimo.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/96887231852.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rijopagive.pdfIn PDF document text
    • http://exima.kr/userData/board/file/mejufi.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/wasujikasozigixeluwe.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210919080426.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/05176e5631bbcdcdb768458740b486af/retuxosizomigugug.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gn531nipo9n4rb4ubhkvdrbpj2/52358606270.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161360541efab4---sanopo.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/gapufexuk.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/lutixix.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/penuj.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2e8e6f60b98cfa2bd1b51d66a5a2f774/xixoxisowekiposi.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/65384560912.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/12697569865.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbed5eb2d2d782c2a7b1368a90261/bovejezil.pdfIn PDF document text
    • http://baove24h.info/upload/files/jozizoveka.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kujemopufakesefu.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/41582918721.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/80859094732.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/pogurosunirivibamaxowifif.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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 18016 bytes
SHA-256: ae3e2d6ab2afc8f8c4d0f401525673217aa5e43e98443306b774bfeab823928b
font_01_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 10708 bytes
SHA-256: 28535bf13a596fc3dda32d0fafb4cbc468704f3b0cfee6cdcdab877071f1fe20
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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