Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a92212df449997a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 23:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6743d040129b89916776e0d24ce936d8 SHA-1: c07ac4e80b7307d93ae7666b949fda0da7f27c0d SHA-256: 8a92212df449997a9ef5b31f9071b1353cbe382816cb3b44830f4a8a553b97d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=tiny+rails+mod+apk PDF link annotation
    • http://gwardiajuvenia.pl/zdjecia/fck/file/45154729217.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/96865568526.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/56064060697.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147980585ff4---dijogewejomumaridamavike.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/76584388383.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/8535262854.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161487a1362150---29742767935.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/27289998915.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486a73283b6---47155552131.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kisaxexudufug.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/duvirorase.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145420019eee---vofabaxopiwujupimozi.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/10888317783.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/potudemadilifebafi.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/50147488606.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/bedefiwusogizokonegebabov.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/suzakuvuvipafomuvisosevup.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/35111187411.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/paburaruviw.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/zinofawevuloboxo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32a0cb0d---ruzetuzafa.pdfIn PDF document text
    • https://ambalatender.com/upload/files/feruzulupoxubo.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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10492 bytes
SHA-256: cfc1bcc2d1ebfdf482e504e1e5d2af3f7149d46dd2cce459d17f806e29a323e4
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17348 bytes
SHA-256: 6166724b74b129484e6d8a2ce8c41c52e59220b6985b3657ee06e6fa05847128
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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