Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08116aa14509180…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 00:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03120a75edf46a50fd0db1eb524062ba SHA-1: 0436f5e56c6e4033fe480cf65bf0dfbd5adad000 SHA-256: d08116aa14509180888ccef0b73b9e36295f6e104094a389e4dbd8cdb6e590c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://pnktools-th.org/ckfinder/userfiles/files/nanekes.pdf In PDF document text
    • https://aokman-drive.com/d/files/tutemuderawojasawemij.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/givinumesujovevuki.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/banulutivememuvefod.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/sitinado.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613279025817b---49402513411.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/1695008297.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/40039926407.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kadikilexezaxam.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/e45getmcnchjcqrqpm29s9n954/mikuxowowozulu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d97250736bc8a1562d36cb3cefab7b12/bawivodonijowik.pdfIn PDF document text
    • http://fedime.org/imagenes/82556385336.pdfIn PDF document text
    • http://opersan.com/file/ruforawefemumowo.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tiruwo.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912070938198308.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113ed73438---96415775602.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/luzagumizoko.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138135460882---27429471229.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/sopokafa.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/gegolupubabu.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kejaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390894e2f74---fapiwojomenisazepibexoxum.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/latubobiku.pdfIn PDF document text
    • http://cl-pub.com/files/files/gajejofololobusisupovu.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/sibonexefulomemukujizal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=good+selfie+apps+for+androidPDF 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_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 17180 bytes
SHA-256: d1626ea6dcbc896caa7605454f86ced2b2bdf63f16458bada8ec85ee152b0a13
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10432 bytes
SHA-256: 71ba47bf91784c6f2db149a94baf4acad245cbdabc37dca14b7f2308a2d252ab
font_02_sfnt_off00012ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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