Malicious PDF — malware analysis report

Static analysis result for SHA-256 b574874dd54099ef…

MALICIOUS

PDF

104.2 KB Created: 2021-09-21 02:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 262d3f717a380b87f88495e1511d55b2 SHA-1: 0525ed9c62fa0c7e43aed5aa9288c9a05b31545d SHA-256: b574874dd54099efb0e51b0f04953d1167836a52e0aac9b3e57cd5c9fdb7c972
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=flying+cheat+in+gta+san+andreas PDF link annotation
    • https://westhygiene.hu/editor_up/finokega.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/74280502380.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutovijadomabom.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/jupimifinib.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tibafis.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/metefafut.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/49284594164.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/has6epha0nrbba5favvbt5n985/zovozikezidufawojuxom.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/38757548799.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vufogarazowifugabotorep.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/62964499917.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xodamoke.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8kc38njv47c9mp8a9bfetm3iv2/61860001610.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210920231152.pdfIn PDF document text
    • http://ombs.ru/uploads/files/sazuzid.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/diwoverupajexisenoxodul.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/83402553199.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/58149787663.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/74383586505.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143946ead099---punaxebatoxaxafuzoruturoj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614917e155ca1---pebazilejogugo.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_off000133ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 10620 bytes
SHA-256: 170a5dadede5140d66a2f1dd2f0f54bcb67adc5ad7eefde2e392185c3125bf64
font_01_sfnt_off00014bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAB 18096 bytes
SHA-256: 60cc52b066cb4db0aeb96cee41dc3b32c16989e65e83251fed46564e7372141f
font_02_sfnt_off00017ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1