Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d622d7c815fc1a6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 14:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e257e83cf9aaeacf1bcc869b85454091 SHA-1: 6789fb39c05d126cef4f2b8f266ace2631881a05 SHA-256: 5d622d7c815fc1a67eb14c1926f552948d3843439b9a216a18adbf85ffee8cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bf03fa2ed33fc9ac591581565738a1af/lilojitirufix.pdf In PDF document text
    • http://mim2010.ru/userfiles/file/sedopogu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lekelakatagukisedalilem.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/giken.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/64535363030.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/37983557509.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/silezot.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/vijuwavuvi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bazesoxewenepedez.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/zirakemajezapuvevuwenuj.pdfIn PDF document text
    • http://zerosquareonline.com/file/diroxuguxafadem.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/sijubupuvob.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414fb6dc060---54220174701.pdfIn PDF document text
    • http://etre-belle.su/images/file/45822623058.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/joramabigopikisiz.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/6898072607.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zeniloxevikuvaki.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15c9c3edd---jivovunakovir.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/23142441041.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/24580953689.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/karubekobixif.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/bifigigim.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d462a519942abc0e5cdb781ed74bcca3/vofanisemaxivajelit.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/22165697347.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/zevub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=call+free+hack+mod+apkPDF 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_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 10544 bytes
SHA-256: 2600e3b48393ef5bb75204321b016b1527de83b04ea658cae21d275bdfe7144d
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 17752 bytes
SHA-256: 15ad19f60235cb3cc21ee0115c6f483168a60f6be1a963f8281456626cb81023
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1