Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a5649d4b29054a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 01:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ce1997c099ba9ce2a8aeee694aac41e SHA-1: 355a7a92569ef35ae813ea20f2ead101c7d924c8 SHA-256: 72a5649d4b29054a36980a352326e58ba0d4fed9d93429691affb3df95a7c6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a distribution or SEO manipulation tactic, potentially leading users to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://faresaldabbous.com/uploads/file/77667057783.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/mifatexawamirufi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d37735ffa044e8a52eb920aa7cfef133/16166903615.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zuxajodeb.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h8j397a3dhl0cb08mtubmf6j2p/lojejegesomozomarezuva.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086578fdd8b2---97391083681.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9a599773---miriwojewaluvop.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/92026931034.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nevaxupabi.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/ginofuk.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tovatifikuxel.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/19638376194.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zetevezeweligolefewaruzap.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/83177827898.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a1a5f241c6ee2d01f4650079cca7b5da/vepusuwasegevovow.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7643342c45870dec537a326e6724d889/31111716725.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/41bb9fcafb2a7e651d92fdc353055cad/zuduku.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/78928936147.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/082ecc478ea6df290419cf4c5f933be8/ginunivenalifilopef.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/18034522352.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bc512fbe9---80396578208.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nunirilokofabotorutos.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b3b53705---getalevezotebera.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sevanu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e0300b1fcc62241da26c9b9d9408a23c/raneweze.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/basururixedareliba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=better+is+one+day+chords+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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 10836 bytes
SHA-256: 0a52de9ad079e6e2ffb855e3c60c9799f2f52b5dd359c64804d3a2d2bdf50627
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 17624 bytes
SHA-256: 453263d095e5a342fc8c5c1b061fcca75ffc6046f0479c276b245b25fa2c1f68
font_02_sfnt_off000134cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1