Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a9c0ee1e8cf011…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 22:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e14e26a6e18d5abe6b404d1ff7c4593 SHA-1: e8f4682d5504fcfb82b74b302a721817ade84976 SHA-256: c7a9c0ee1e8cf011af445d602f7ed27c955dbfb64636e137bd6df3b839947b37
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bjsixiang.com/jingkelun/userfiles/files/20210815184655.pdf In PDF document text
    • http://saovietgroup.com/upload/FCK/file/fesalurusiwodiworujin.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160999c7b8bf65---wapomuratejati.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e15f0dcc---mugezorofegoti.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i2dk0h0jmram33j3b10krtu27o/zikabosamexi.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/2595690274.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/16209906420.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/tumuwidazaguposuremezebub.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/53883455635.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/vujijezunulijijoviju.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/rosofuporeneduvavonaxuj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29bb9544b0---pisaw.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210702125140.pdfIn PDF document text
    • http://sun-tes.ru/files/file/woxelutaxebijolu.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/73032294776.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/kokoxapi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42de714004---90023897581.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/66696882856.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c814bc6b0e10c282835e2980ecebfd1a/63559105927.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/karadibixegefude.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/vefabaxalegamomegazorive.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3uoulmskhua0p3930dnjfe5q57/50175664375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zita+the+spacegirl+free+pdfPDF link annotation
    • 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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 18304 bytes
SHA-256: 883452f2e0794b6ef83fd9a6e8fd18e89783e4b45d2af98f47f43a1d8213e239
font_01_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 10640 bytes
SHA-256: 998a21b198460a2fd2e81e3187843bcad9a0fc2cb8b603906fba0960572fcd7b
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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