Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f466b7b130ec469…

MALICIOUS

PDF

87.0 KB Created: 2021-07-25 04:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55b90428bd2c7e1c655de9989b854272 SHA-1: 975f5e8806cb16c44281892aa57eb0e02298c91a SHA-256: 4f466b7b130ec46972d5a90a84e6801e64552da5401ad32cff8f732ece5e3663
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or hosts malicious content. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aklond.com/UploadFilesfile///2021061012264540.pdf In PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/81226780362.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/bepozulexidupunumorirub.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tovirawatuxejular.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/91528397132.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f0fcc492---95032622398.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/kenebutugedapawonime.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f95ae54b6---verotepete.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/376e2007918f2e3f0e4f129b0f8432dd/gojixaretos.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xokumawomuzut.pdfIn PDF document text
    • http://someteme.com/archivos/_20210704232953.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9e046f54aaab03a9d0799f41e7aa7c90/vakesuni.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05172ebc86---natofowit.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81f2b9ff40cfaae07c3d5eb56621f272/xoledazolokomot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9c0f0c7c---45681656780.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/tarapomadi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd114da668---tonadegurifajopezeropago.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fefebob.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/nesalazijigizabodurimol.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/55797964.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/69951e4f3031aa4e93d335649c4dc63f/kefepozufiwexutulebiza.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/bezuzuwesewaboj.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080591d05925---nokigarusifosogiditizeje.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/49045797659.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/dutubume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+simple+slime+with+gluePDF 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_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 10764 bytes
SHA-256: 57284a990dae9590d866a18322952a38e65ea848408654b4538ff5d9b0d03f05
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 16652 bytes
SHA-256: d5ae1d0d7b95b10a8eea664f5ae44521358feca92febd651f589acda43e1cb50

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