Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdce4a2ebcd47d25…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 02:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: db37b8809789ff85833347affd3b8445 SHA-1: bb386d422bc64a94bb0810a2e8369707e431c522 SHA-256: cdce4a2ebcd47d25200ca83f888bf5796346c38f0099d392ca582063276534f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609834e21d61f---78235251652.pdf In PDF document text
    • http://ccspevents.com/clients/24998/File/tiwidepodumewakedejewozop.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2b9bfe25---7605639748.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/49190815a6a160f39e1cfef22559f60f/61880974509.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/68127354014.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/35122912838.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/30264610694.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///kazetelewijubage.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8be56f80---28707439930.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/liwutasufubogawudun.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6e2680236708b7fafad1fd9b9b9fd054/duwubib.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0ev2bdp2tsec7tssfmma33nrd4/bumarixi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65fd62c1ed---91195621993.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a606960ae84---lezedimarevitosalerazidiz.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/taxiwenuwoba.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c849202---nawojonajaserate.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/dapamoledesu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/50278538554.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9e886511---15568509543.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e520c0bd7---jevisosididosomaduri.pdfPDF link annotation
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62b789476---22722359133.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k909d6i7fvfobpqlt4q6jptd07/nawagikezesusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+need+for+speed+most+wanted+android+apk%2BobbPDF 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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 17228 bytes
SHA-256: 84af9d422c1714c25aae955e88912706c8ec60898f346dde999545205f986b22
font_02_sfnt_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 10976 bytes
SHA-256: 87e1399f6a1e27b54a2fc4dfadfc603d6304b063a7dbd9fb4e19b77b9d8249d2

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