Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b09b735dc8661…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 06:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f34b3e42c9cc63fb609bd7a7c90d55ca SHA-1: 7bd97d4e15adea2398577bc9ae246647b3cedf60 SHA-256: c53b09b735dc8661eaeef7678812c389f81a45f02721019aab6b885087207080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or scam lure, likely delivered as a spearphishing attachment.

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://crysiq.ru/uplcv?utm_term=genshin+impact+quick+primogems PDF link annotation
    • http://pkpneu.cz/userfiles/file/67820399091.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/16227529572.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613db838d9b0c---89431510929.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210911_70A143F27E580C18.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/9844073824.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/lujoxoxivejugirewa.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/17916661595.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/7927983041.pdfIn PDF document text
    • http://jsdarvin.com/files/gobapase.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146682796111---nekore.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614217daa21ae---bulasuji.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/71447277803.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/23427777774.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/60552016075.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/wegesozuvelonolivotenekin.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/69219872955.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/84384623589.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/69648f07ddfe6eb7e9ac487543528f4d.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/79925913960.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368e62efa97---niditez.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/41923335075.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8f50d38dac399fd457aac30d195c319e/50312905862.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26a9a1349---mapofiwasasiwilu.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/64104029028.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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 11152 bytes
SHA-256: b9999ac20390d202d54723d804605a459975c608bf6ba071da08718d20d3e106
font_01_sfnt_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 15372 bytes
SHA-256: d352da4b2962a65e5e822eb4b660df54e01477f6298e727a04a988d6825c0cdb
font_02_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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