Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dc6223a4ac8298…

MALICIOUS

PDF

78.0 KB Created: 2021-10-19 15:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6d2dc0a9c744f967648641b6b1b2d4c SHA-1: 00482ec60abc418bcc91dca76e7959b38313839b SHA-256: 28dc6223a4ac8298e47beacaaa6e852ea5518e788fade0aff6dad89aad50a9dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dental-essence.com/admin/userfiles/file/segowefuxamemoreli.pdf In PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/82383363587.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/supemodilifip.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/tefidategofejomab.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141645ad6dce---33866308778.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/30518050680.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/33819416554.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/40784796208.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/75048040110.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/bawazasifi.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20211008_172633.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/98312341554.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/46168123456.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/ximupugoril.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tuvajafabekemomipaluwaxu.pdfIn PDF document text
    • https://vatlieuchongnong.baohohoanglong.com/userfiles/file/dobiwogeguvoterepiba.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/96973289356.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/76274522923.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/069fe64b49bd414f2d665efa7e0fd66f/65805947446.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2f10869e---lutegejolozugarepugisul.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/davijotiwabe.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/mavesisozekamajogopive.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/78167271bd0b0ef066ce78511adcf179/40211113980.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/xoviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=intel+5+series+3400+chipset+driver+3b34PDF 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_off0000c286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC286 10992 bytes
SHA-256: a0a5f238e05c8eddeb932edc5a778c5af8f641cff61584b2fc5dc445c182187d
font_01_sfnt_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 20712 bytes
SHA-256: 5b537bcdb75a8b69047c534f2527f5e7f53e82b3f41ac9215ecaaa4b563b8a0a
font_02_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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