Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c577675ca5e8ac…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 08:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0edbd8ae9b63289f02daf090675c7196 SHA-1: b05825227fd929821cb896c2491b6adfaab9d3da SHA-256: e0c577675ca5e8acd66a8dbd81f4432b027d3154e7f5bfec255707c497d16cc7
156 Risk Score

Malware Insights

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

This PDF file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting domains, suggesting a phishing or malicious redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to further malicious content or phishing sites. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://infrive.ru/uplcv?utm_term=blueberries+for+sal+worksheets PDF link annotation
    • http://stinpo.com/ckfinder/userfiles/files/24759211815.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/melipojazi.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/mikolofem.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/25359738302.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64c316d78---8863920452.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7b16c227---nejavofawazevirebop.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e5721af0---14627410647.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/pomadobajigesinosubo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160777b47315d1---78741546776.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fae6d4fe6---kewebuvezakafukuri.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b7198380---pajerotumaxuredomi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d943a02fb86---12970634300.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fa89a11ee20373175fe6e448e2f5132/879900674.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/jumowegipuxumapifi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/36426283765.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/laefbr8mui76hq173g8uvta7df/40418309467.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/molovaguketerozam.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210606015035.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/lgcclouma1u420044rn9b6ol02/20965902112.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/kakemupidewebipax.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee01371298e---kitor.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/fawej.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/92267810208.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/23470758152.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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 18788 bytes
SHA-256: 52c1db86eeac4b1a5bb18d017341d7b1b76934f3ff9895e9b3fe88ef985911ac
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 10676 bytes
SHA-256: 5ceedb8d8417409e8028f932a6d00946bfefc5c29af6ab71291f9fba422f060c

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