Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d3fa1887fd663f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 13:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c58b7d10a1d261ef3078ac93e57aa60 SHA-1: fcabdadfc2bd1abcb92539a0108ec3dd5ff16a3d SHA-256: d6d3fa1887fd663f9c0bc4de9e4aa75fa2ab6a2b8a31b8547135a3cd0507947c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace501ba80f---68605413935.pdf In PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/valulegopelimukemibed.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4502d3e84d8f5ba97a507185046003aa/rufuxev.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/rinagelusemovararopoku.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096829637cec---43645761788.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160beb93238e5d---12353515379.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c144fff691d535eb4a0deb18d25e005a/pujuvaremasowowom.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xowozitetojejamuzi.pdfIn PDF document text
    • http://rsentco.com/upload/file/bifisililepopubifosexa.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/pigepuxakixuwowadituneba.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/11219473298.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d5dce50c---9015736375.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b2937bc8---rolirovivaderet.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/31090517703.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e8ff5380292905307117212ee9a9a2a1/68360153965.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gisimimazurovuniziduduwu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ks9bhu9oi7ej6v6grssg5oce56/41112687355.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0e42a621---99554567564.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/92009388a6c98ae95202b4fcccf60779/ravilejofosixonugoto.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/37761286590.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/joguloxalega.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/ponanaxer.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609888c37e8bb---82779273944.pdfIn PDF document text
    • https://edusfera.pl/upload/file/29515586269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=english+root+words+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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 10552 bytes
SHA-256: 672f4fd9c3cf2a25099e6c0655308e7eec2114a43f5f9d3fbe01bc3e7592925b
font_01_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 17620 bytes
SHA-256: 93c9e8a2415919e1e24f028328c15c016ff75b45af1717af0798eb80fca243ee

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