Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d07c4c774a1522…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 23:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac232b15dea9ae8db75c17403f55e0c6 SHA-1: 1cf0b6b6a17ff287c20bb633c458f7f077981aa0 SHA-256: 81d07c4c774a152264b4e07fed0165a6228bb3e1bf76abc6cdd074dd8d33ac0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=best+betting+prediction PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16112d59127df8---gerobafomaladitasakadano.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/45851025654.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/mapanefoxivetiravug.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e0d5f3c53b71df7e0b96a8e9d028bb76/93496979254.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6b5aeb65c32fc21f7713d833b7365c14/10380557617.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/muririn.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/18606794310.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec47d837fa---fedezuza.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/35261181913.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dab57c3f53b---88663242077.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7thu7iguvi79sae4r2jicnio14/vuzafap.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/75784778777.pdfIn PDF document text
    • http://ocbond.org/userfiles/files/80412405471.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/82724903798.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c45e03dfd---rarajudolofagepidodogoba.pdfIn PDF document text
    • http://myphamasia.net/upload/files/tesadodexufudow.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/budetipagusegomuxotoxawi.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bumufagifizib.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/jikavutonudusuvajeda.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/wirovanexe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b496647288d---47509576394.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3s0h8vni1v9u2kmrst4gqd948o/10061757746.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/03bc1f769cd0d037b68272b012556c09/80214798295.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de28f4b3e80---sifematote.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/54750360532.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2de816e039b058555de582f60ed2e97e/motenefaxivatidirosomu.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/39126469388.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_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 18688 bytes
SHA-256: a2f9ad634b92308f1ab31a5c57a22a483ae229b84aa84715356357dfc8163dad
font_01_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 10672 bytes
SHA-256: e61715459aca960fcc387598ed4a6b50e5b42b4320472f65d86e2ebe1a9312b4
font_02_sfnt_off00013bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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