Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed53c4e8845fd815…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 04:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b806f555e6a0bae45bec1b9020ad426 SHA-1: d6db76e68d50d2174ded5851c0d74997c372e8e4 SHA-256: ed53c4e8845fd81587d21fe4ac07b4be1e966e897f1e60db197efacef84fb5e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress installations or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating numerous links on distinct, low-reputation hosts, often with UTM parameters, suggesting an attempt to manipulate search engine rankings or distribute phishing content. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=music+downloader+telegram PDF link annotation
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/500770b0a87de8a6744ce8695130acbc/50444351830.pdfIn PDF document text
    • https://questyme.com/userfiles/file/71680106763.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/31430590860.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111901475620.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/45128042870.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/35339896993.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/36643862693.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/wozofijarulakitevu.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/zufepuve.pdfIn PDF document text
    • http://youil.org/userData/board/file/zozawakejexefusadimo.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/lubikuxelepixariwiw.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/xonunadadenepumuwezex.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/mudow.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/rotewevetodidopakas.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/85865216556.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/35070406097.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/63353784099.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f5a3c89e---wodaxaduxomepogo.pdfIn PDF document text
    • http://rs-entp.com/upload/file/49637766408.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148483932a48---rosizugepivilezim.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901055411457530.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/31008403333.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/kovarenegufadepel.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_off0000aed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED7 10892 bytes
SHA-256: e36e6571413fcecd7a8c12233ed31f64098d3795fc52b4e80142148c1471b6f9
font_01_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 15844 bytes
SHA-256: 0815e6f37b98e470acf69d26eebb812686dead6c320c3632ed2f810567f8ddc9
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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