Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d4d40e71ed0762…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fe5a492098945075c124a9c07606409 SHA-1: 96d4e1c4b9695739cb90d08e3ae47ea2dc5e576a SHA-256: e7d4d40e71ed0762115f0577cc6033dc1cb2987278d8cbd42638540fd93349b0
164 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to PDF files hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=hero+420+full+bengali+movie+download PDF link annotation
    • http://woodbridgeabw.com/uploads/files/nusad.pdfIn PDF document text
    • https://securitydm.com/slicice/file/31179648430.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/witubedozugutabiwepa.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/mujepasoxorupawa.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/15779612970.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/lesapozijunage.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161462896b8c33---34330838162.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260cdc821c---12122280287.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/51954487554.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/43344995782.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/80628360846.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/xinudupexose.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19017363e---57240843052.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210918064542.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bavajuxafeloxoxabetap.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/99077078486.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/lowakerugudedanujekori.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5904f7dc---sejeroj.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/68570130972.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/38951140897.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/73972673736.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/62412f52d285e94d6b13ab7277dc5754/14638073184.pdfIn PDF document text
    • http://nemochem.cn/upload/files/guvovubugudi.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/xodobixezodajebi.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/rewiji.pdfIn PDF document text
    • http://alltechsro.cz/files/22529690589.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/57150085895.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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 11132 bytes
SHA-256: b9fd86d2f3333026d28d6f975cc192fcecdcd6f9fd416d36380d7194fdc47ad0
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 17344 bytes
SHA-256: 16796879513ff94a33aa9cd651e61493d3b5f14869bfc963d4339ebb89719d17

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