Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d753f9bb16fc33…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 09:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d0ad6037a3a0bcad7381a5635313e133 SHA-1: 92a7fc2ef40b2a0d39f5d6a193c4261ab048c2cc SHA-256: b7d753f9bb16fc3392339bb6345439913ba1aef22db3031a5b58a7ae5cee07d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=data+transfer+to+new+android+phone PDF link annotation
    • http://galeriejacqueselbaz.com/userfiles/file/fewisemuxadasa.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/kowelipipofami.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161307378de19b---96840484106.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/temujepetojijojuvo.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/41918013595.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/16476916502.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/tonugokivemosumevi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b98c7e048---jivosuxapisuwupilafubo.pdfIn PDF document text
    • https://solturism.ro/images/file/69919479879.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/fepibazivunufipigamezi.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/44161168533.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/zejonenep.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/gurosixu.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/raropitexedelalixeben.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/44954442524.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/98072812956.pdfIn PDF document text
    • https://akconta.com/uploads/files/80956003651.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rhdng4aaifu9f8cg862ugjdauh/75191226803.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/kewobedodudi.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/4590380935.pdfIn PDF document text
    • https://cmf8.ir/data/file/wiwodewumopexogir.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210916015755.pdfIn PDF document text
    • http://sivam.pl/files/file/jufukezisiro.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/53450903748.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 10636 bytes
SHA-256: 5bed13687db28948b9782ea8f58952de8560967395354b031ac94b0532ae3ea8
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 17408 bytes
SHA-256: 3dbe25e98009895c6fe943730a4a0738c116e701e23c56df7a8f0f9f4c30f329
font_02_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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