Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1f08ffd618318d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 23:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf30a349a5d4b5f8ccab7b06493aa44d SHA-1: 76a2ca0ff8a8479dbe9e43f99ffa464255b89a78 SHA-256: 9e1f08ffd618318d778bd3567c50212189dcd60914cc9ce3fbbce96ccde3a5e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm serves to obscure the ultimate destination and increase the chances of a successful user click. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://studiosiriosrl.it/userfiles/files/ruvogatopoginufenexizuxoj.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/av8ls9hckqopue8222b5s9kak9/67865656223.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/talosakubaxobigudiv.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/jotaw.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/37782550239.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/kuvamizarufasefivo.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/runerisejanaliv.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/6663118932.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/24484501066.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/71227554142.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kafotifixuzasuvedu.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/tokativizowetabu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2torf2uufmb87uav4qf5eh8nv0/totemumowukidonafupoj.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/15588301886.pdfIn PDF document text
    • http://lecostationery.com/files/file/22274700339.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/147351980.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/tarupe.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109162238305394.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/39684397670.pdfIn PDF document text
    • http://nktrading.qa/file/files/55814480454.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/tuxabigilaputenadosu.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/9943843771.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/38558580025.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2780ec02f---jekubexawexebefajamasik.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0f09e925aac4dc71a4cc821ee8f8cbe5/48256561988.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/zesinexefeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=asphalt+8+mod+for+pc+windows+10PDF 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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 17484 bytes
SHA-256: d241e9ec0fc0309d1bada0ddeda3a087486bf9c37ea538f0ffb8be8725884e5d
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 11200 bytes
SHA-256: df4f1414110730ea3b4fd8e19b65fd422fa544735e18a118ab26d588fe9a06d6

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