Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2104ec498e7ef1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 00:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08826e4b38d8be04df671cabece0f42a SHA-1: 02854d5e4267a9ccb999346c711634c5c834a465 SHA-256: 9b2104ec498e7ef1746e6d73177a9129ef5b58baef55b8342b50701aec819a9f
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of a 'download button' lure further supports this attack pattern.

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 http://greece-ex.com/images/blog/file/59815150316.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2cfba295a780fc76d0c3e48aed6f349c/85225614073.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/89034983339.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/79207620294.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/lumezilar.pdfIn PDF document text
    • https://majubesar.org/contents//files/67692430050.pdfIn PDF document text
    • https://digireg.dk/upload/nojupaturovapen.pdfIn PDF document text
    • http://jaika.in/images/documents/files/rolejutevagenobamakusiru.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d30c25865bce1cb7c7fe579d9bc228c1/pamemupowafarase.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/64260829696.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/seridigurigevajuweboxopiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48e6102979---72542584580.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/menoliwogosa.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kewadotozoxo.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/50478171312.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/lamojokaxamorurodonaz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19ba8bcf3---vobipudajimuneforolepun.pdfIn PDF document text
    • http://faradbox.pl/files/file/jebejopinun.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/wogulofanob.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/kovigivatak.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1a762ccb64c631352e9635f6b2cbc7cf/92505235644.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/saserowowefomete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=keyshot+animation+tutorial+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_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10968 bytes
SHA-256: de7972d173df75eba2817d99f52a5e9e66f611b3552ef88d64d3af73d96df7d0
font_02_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16380 bytes
SHA-256: db8e47e8a89eccf93bc07e2f69f41176ee7228f113d84e80a4ca9d5886dbcf53