Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46f52310b3d6b71…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 04:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90fdd7ad451f67ff9f36cef2cef7336e SHA-1: a42d54cd7b2cff3dbf94360b6acbc508e1bf5fb8 SHA-256: d46f52310b3d6b71d2e6c79bcccb973e7e0372ba98b60e539bdcb9123c9de8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary function appears to be acting as a link farm, likely to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=basic+multiplication+worksheets+with+answers PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772cd1c39cf---ripapowoj.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/47329492577.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/xewiporavobidukujuj.pdfIn PDF document text
    • http://huimao.com/upload/bizibize.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5345e1c0---dagaril.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210803161428.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db562d504---zidusaxogabo.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/68812751747.pdfIn PDF document text
    • https://ketoandongnai.vn/upload/ck/files/rekaxuguloga.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s8bpl7e9hjrghtmajcv2694asm/99885028354.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cd2f76a857fb614560de2762711e5913/98983811591.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b2cdf87f---wubavelapadajasowanun.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bikubavavanu.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/dizoravexuxuzaralajex.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160981148463fb---viwozazupulu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/27085639538.pdfIn PDF document text
    • https://digireg.li/upload/galipewenaxubonida.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80vevcs8e2ft1v9nmoe4rke811/29184295500.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/pobigigem.pdfIn PDF document text
    • http://opersan.com/file/paderijarajifaw.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xujekevilopa.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/88928964642.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/pufuzadodomaku.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h4rdbo48pfedt97bruo8sa9e5q/33366052824.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://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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 19424 bytes
SHA-256: 8ce804c851f06706381433cb591d7d6b272fcf90f729caecb928d92ee4d3db05
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 10968 bytes
SHA-256: 6a782f3e5dbfd0a6d573026354937f2dbb12ef47429bc1a40851500a4775bf49

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