Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c619e4664ad35d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 18:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7fd780dceaa8cdaca7007f80064637e SHA-1: 44dd40ae3e61ab4c504edc6fa3c84b5414449dfb SHA-256: a2c619e4664ad35d87800ba1488f12ae3d843357d3e756b0c1452a951916e695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=hacker+browser+apk PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161346c789a81d---48319479106.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/nuwurawinagotebuzuko.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/92566722059.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/16236944206.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fanedosodisi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4081bd378---xagilad.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/88873799445.pdfIn PDF document text
    • http://quinta.cl/upload/files/xixixenasedikotop.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/86042467664.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/japojodofodoj.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/82902083627.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/mefonuwemudo.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/noxovumapikevo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4158cb92e6c91e9f12b356b62047528f/18851725478.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/25042058863.pdfIn PDF document text
    • http://bronia.org/userfiles/file/98525530062.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/75444312182.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/49929384568.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d734201b0---zitafipolowejizula.pdfIn PDF document text
    • http://theponghop.com/upload/files/18845949550.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba0cbea8f---pubogopadupil.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/rejedinefojisegomajan.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/zajemunoximaxibura.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/vifavaxomibusorafanotibem.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_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 10336 bytes
SHA-256: 2037bcc3f723834e6c7dd7d31868c5a6ab1fc888ab62bb89fc56f9f7f341dc2c
font_02_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 18164 bytes
SHA-256: 89f6b1f2242fafa6664d4576d05b29f0aedcc6b07d6529a0f6a2362dad6d3723