Malicious PDF — malware analysis report

Static analysis result for SHA-256 538aca4f41eab89e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 00:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e32460fd80f35af9c9c60ceed5154266 SHA-1: 5ddf95b80197eb194efe961a95730828145dc0c1 SHA-256: 538aca4f41eab89e795a940d09a65c5ac456fb8ca20754f59bdc211f3b6dcbc4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=101+chess+tactics+pdf PDF link annotation
    • http://webbolt.fono.hu/data/editorfile/93609847106.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/17212896809.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/liwoj.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1db1a4fe5ceeed8f88387560658a4d78/wuzojalogisosage.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/84199166662.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161441534df32e---bozopepafeke.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1885129f8---45919371777.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/47599367590.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/bemoku.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161439635bb3d6---bufix.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161430e32943b3---60459109362.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/58426106024.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/36222946863.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/15065670492.pdfIn PDF document text
    • http://bluebossa.pl/files/file/66617829761.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/gufanuboson.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/37063152444.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/kugexidum.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c92e877df---badatufegusivezevidejete.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/27861737346.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wever.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/magetotixuvifokolukozen.pdfIn PDF document text
    • https://petikdaun.com/contents/files/lewenekaji.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_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 17392 bytes
SHA-256: 3f67e1f84208cfaeb9b3378854b24d93bbc454840320f1e7276244c2b98e2623
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 10424 bytes
SHA-256: 09e341538e29728883a3ea60c9f1d1da782e601067d921167d2175c7977d66e2
font_02_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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