Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7980a2ef7529a31…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 12:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 485591f8abd8acc073daa4ba8b0f8e67 SHA-1: 63ae42f03291cd8ce44cb5938f7e4110fcf8f95f SHA-256: d7980a2ef7529a31d2d3a981f266c5ba3795dcde29fe75e190de0e661ad3cb84
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm characteristics are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://historia-bfured.hu/userfiles/file/wanejer.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e695b515f843d0d754cc96578938dc7b/wosekitudemadavisazu.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/jasid.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46dc85625---90750798601.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/jasevadimek.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6b6f1dfe---xeragejebamosevi.pdfIn PDF document text
    • https://orangerun.re/photo/files/xovuruluzod.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/73647194265.pdfIn PDF document text
    • http://aps-mes.com/files/file/90594888496.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rugatoz.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/82117283516.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/97090484827.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/96755356661.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/sunoxokuboniwepujovevu.pdfIn PDF document text
    • http://metabolit.ru/files/file/10502145641.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/90783621011.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719039bf8c1---monuxofegawovusaga.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/gulenor.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6093ea63b02c7982459bdeb23f006288/87328213319.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6485543737.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/najejozemufaxawiboze.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161244a3a28a60---zuxokodawip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+tutorial+pdf+free+downloadPDF 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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 10492 bytes
SHA-256: 9c97483af52bfbeaac2e21f31882dc551ebaeb4985179ae4a1eeedef7c314d6e
font_01_sfnt_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 14060 bytes
SHA-256: 66620d40d415dd0255c4c47f861edec9cf5fff6caa96a00ce70c019b897e6316

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