Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a980632cee5063f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 07:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7556171abc913f1ac90a97c8f766c46 SHA-1: 7d6e923e881fb0e79e72acab4556b89a6b1f8540 SHA-256: 7a980632cee5063f2e00d12a69ed91fb87fc79c0308183cafd0f0996c626d38b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://thegioichuyendong.info/app/webroot/upload/files/88634240977.pdf In PDF document text
    • http://geodavidepini.it/userfiles/files/tekuwezorikam.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c1ff9754c3a0e04bbaa56f5b92579b4b/87187657655.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///palufox.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wobuvilasopefadezif.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/75396210643.pdfIn PDF document text
    • http://orderkai.com/uploads/files/dedivevujowoxebabumomo.pdfIn PDF document text
    • https://luminex.pl/upload/file/jotogusiwujezim.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vitunekofiretujegizezib.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/lanadilolevefekosojolezip.pdfIn PDF document text
    • http://symbolfoods.com/files/file///72850728037.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/poginidetiwanosamejujaje.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/48894642637.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/48c6802bceec0dc9b5f1d50c63fd2905/jifozol.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f31009c0bd0f46cc96b4934a5f5aacb5/47898034788.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/81970123094.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/50269115913.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/4316577619.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/tumibo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bonowarutivalasaxediwiv.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/labaro.pdfIn PDF document text
    • http://rurisnet.org/images/file/95553222682.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/83193269031.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161425995d1826---68286727928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=molecular+biology+of+the+cell+6th+edition+free+pdfPDF 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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 11244 bytes
SHA-256: 62db8bfaef14d415d4153e02a5a42b2437d24327b4c7ec514680159fd8280bd9
font_02_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 17584 bytes
SHA-256: eb2b0074e8d2a363caa7effeb30bb5d142e8460fe00f5a228dd9cfff8593f144