Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b96f636e90694e3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 16:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc48112662ea19a2333b5f4fb425ccdd SHA-1: 59a6d5ae3363853803a2b2f6e3b77ebb0f463fdd SHA-256: 8b96f636e90694e31da25a210a5e9c77eb33e09aa2fd02a4c9f9784facee8318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics strongly suggests a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://queure.ru/uplcv?utm_term=worksheets+of+future+perfect+tense PDF link annotation
    • http://clinivetmadonnadirosa.eu/userfiles/files/netubuj.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-16/20210716161445160297.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/14562370031.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5359659e1---bapabilev.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/rupuz.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ut4538jfaih5ca12t2a5be35hf/42401154825.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/92321486208.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/i0sg8km4jktf7da8gro6qunqtp/69704665462.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/taragobolesuj.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/36785456743.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc37cd5538---37162528721.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/jidapaveda.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/u7pv0p7ccl3ve7aj7dr7vco7ro/foredawewekafizuruwepixix.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01a42e446---lovemunepifubijaje.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zanulufinejirixa.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0r2r02fef8losc39mhbilkgksr/majiwokavagu.pdfIn PDF document text
    • http://sowitech.vn/upload/files/36290698746.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/jilereva.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/29731508511.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/63233231062.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/30ccafc748e4f7cbfdb16219c5bc66c2/98360408932.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96182636564.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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 17524 bytes
SHA-256: 1e275dce1206ed767d01ff29a9cfc21eb73fe68059140fc03d85d9e7d5e700f1
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10460 bytes
SHA-256: 7453b27000b2ba49658c17411fcf39a02f0a596dcc695c8caea4a54bc1d815b0
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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