Malicious PDF — malware analysis report

Static analysis result for SHA-256 af328ae70f8d5f11…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 12:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33c6a1e5ab42e3fe117e941e53c05be3 SHA-1: 6bd1dfedbc1ff805ea4a35d9d276e09693b9f516 SHA-256: af328ae70f8d5f110ccfaa53140627bd3813e31f9206d5f69428a18345234a3e
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions, such as downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=pals+provider+manual+ebook+pdf PDF link annotation
    • http://maraulsan.com/ckfinder/userfiles/files/25549537106.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/puwefufopukalowe.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/18894825161.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/94735210732.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/wupapot.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410b512eb88---47908159695.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zaliwusizel.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/54432033287.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/xebaxoxakijad.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/72812734718.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1e77c4d0---46230809013.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/wuwudalodowawiwov.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/9263195230.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zopazirapubus.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6184781731f1a32d8f63581954ed2658/70900736866.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dipaxolef.pdfIn PDF document text
    • http://koala-al.com/d/files/jixozugadudin.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/sujipukikudun.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/42652323880.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/78303828208.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedonaropidetu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae88d26f2---jazodajezetubulutepu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/tixin.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/34280136325.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/gugokIn 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_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 18392 bytes
SHA-256: bb867e0e73230239863b68f87faefc8f6757edccebd1b33c32add82fba3648cb
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10960 bytes
SHA-256: a2623031702738855e1a79f514e26889e78ec0d5dd796c5ce46b2e867aa0aad7
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.