Malicious PDF — malware analysis report

Static analysis result for SHA-256 1382d16ab5978fcd…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 11:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2019c8f8a7cffde120483c175c32bb84 SHA-1: cf072932c9eec34817fcdcf4c5f69e7d2db8855f SHA-256: 1382d16ab5978fcd88ac7fae07faaad274e347ee4e609587a9e5dde0fabf3897
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports this, aiming to trick users into downloading a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=sticker+pack+whatsapp+stickers+sinhala PDF link annotation
    • http://taikenplan.jp/ckfinder/userfiles/files/puvuwotididurarizow.pdfIn PDF document text
    • http://moneymaker-gold.de/files/15594134530.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/37768113578.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/36730524936.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a35358a30bc40fd95e3e0316dd3d4ea8/kefobo.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/44643899914.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359edbb1d89---femidojovobidudasumuxip.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///6981644592.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fusesevuvipapiwike.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/wutasibijarinorizanu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6f4917f3---3305322647.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/19279147824.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c0c7da726d0ea01f0cfb54fe9e7237b9/xemun.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/76496885159.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/54043493996.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/bigiwufawamemasat.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3963cf4f---wokujanubes.pdfIn PDF document text
    • http://elitk.ru/_files/84459702548.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f050b1e957---79809816633.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8996aed2dd4a623efcb3902ac856ae39/volamamidipisetopuxotug.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/fevojojopebanuwowagogamu.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/moxepizifebotijerisepu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/josukixufuboxavurov.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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 18492 bytes
SHA-256: bf981ecd7e02b1587041464559fc7ae439daf18154f5ebc9d012135d7b987a43
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 10604 bytes
SHA-256: a9dcd50a633cb389aa03ef6e0ad3f98bbd4e64ef2f8efdd95a712c4e1dd2d4b1
font_02_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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