Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3c0d8f95fa5eb…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 21:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d349c7830e31c3c685d443d9c1b38b5 SHA-1: 0855ffd34e6ea47c8dab218663f3957c3ef8199f SHA-256: a5e3c0d8f95fa5eb0925e7f60d9e6eb3443fd4bc816e9e1c658914a7e65862da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://nomylo.ru/uplcv?utm_term=how+to+recover+text+messages+after+factory+reset PDF link annotation
    • http://yuanjiangchem.com/upload/files/95121601746.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/wixime.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rikakakisefapim.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/31353643033.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/42377132474.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/vusevaxanizetixogijisib.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34578806202.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ba5e28c3787cbaca42db7577a7c42459/jekowano.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/81622671073.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/tobebaneb.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/9064675805.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/17586197535.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/relinevuxug.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/3257913745.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/fununovu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/89923022886.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/42705249756.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23c8ca257---12968417706.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109061704441439.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/jozomeraxuwisa.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/029bcdc463a83b617f45ff7733ed6867/96473464420.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/rapopaboxapa.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/51206335890.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/51877656287.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_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 15308 bytes
SHA-256: df98181320997b1d05c65d504d14f9ffc3f34e185d35e7d54384bde840cf1927
font_01_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 10796 bytes
SHA-256: 90229ae3cd444e048418fabce33b9d03a522f0a28e7c9540d1d56fbccdc7fce1
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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