Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bbd2704ad355b2…

MALICIOUS

PDF

88.6 KB Created: 2021-08-10 13:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8706a6533bb00da907d216a04a649e3 SHA-1: 0695b77df7c1b519708e5c6c2e067c7d2b136511 SHA-256: f4bbd2704ad355b2de494777f11c6f72cd08911676b0bb9bb72897fd48c7af6b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f79a1bd40---wowimobaw.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/aee74914c5159d3efec14f0fa9996c16/73553819644.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818d055e0d7---402108778.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/sejorofu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/52261547345.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a5c816b295d35ac40e056f58d6c02570/5997622816.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fa077f7e---45078266255.pdfIn PDF document text
    • http://poorclarescork.ie/images/18049513220.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/lakizasubopunaruj.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ucu62h0burdad26qje7ht7s6cj/3851563339.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/93148584087.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/36586313181.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/31583265224.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/22178892123.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5bh705rvaj11td78hd78i5u7gj/ropugulamodavidapekifokol.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608537f3a7121---bunal.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/acfa37dda8777fe192db3eb34b73cc58/89708542623.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/17063958787.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/majegudezikinutopurobinev.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sikuji.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3827c88354ccd70189f045c84c2f405c/15424811658.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/45906461138.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210623125823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pvc+inkle+loom+plansPDF 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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10496 bytes
SHA-256: bcca611a37de465bf1e3d07298d9c975417999b7bf24b899a764d192808ab516
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 18824 bytes
SHA-256: b7473f71653a12afe778c59e58ab98e974bd92612b2d0c3f65c42946c400e742

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