Malicious PDF — malware analysis report

Static analysis result for SHA-256 6767bcef66280800…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 22:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a964a08037ad2037c15c27a5e043f56e SHA-1: a1da47ba5f0d5a76baae60c9af89921380ffac7d SHA-256: 6767bcef662808006b3398bf048a1502993b0107465c5f07d87365c58f2f84f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, using a link farm to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to lead users to malicious content, likely as part of a spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mcutech.net/files/towolifonapomeri.pdf In PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/36558229208.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/96902477733.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zememiminoxuzumasaxavi.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/20523328043.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xalikeloxujup.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908123624461.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/93074194103.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/34537625966.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/70824350590.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3f1dd534a---sozimijixisosaja.pdfIn PDF document text
    • http://www.bash.cl/media/file/95882496461.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/54052711183.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27620097148.pdfIn PDF document text
    • https://bloomeng.com/uploads/30745483158.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/53857445039.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5f161054---19778701440.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/jutexazoviva.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zunizedi.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/zevutakeza.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/jemawirawatilerof.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4c9ccbef---mozimoxawitejavixokedibeb.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/fivevipejajijizoregide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=all+chest+exercisesPDF 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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 13996 bytes
SHA-256: 114f0d520320289e0e336bacc43975a790ee0303a572c0cddd13c8b1deb585ef
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10024 bytes
SHA-256: 64397439738e669ba8b6e9f712cf256b81631061dd4be55c35bf80b881d6aa46
font_02_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1