Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8f44f92a518952…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 18:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8bc9b7a02421254e04b82d43c197aa0 SHA-1: c52bf5a14a2d53a7d0481cad4b7e3478458543e6 SHA-256: 1c8f44f92a518952ca8fa4eac749d9e2892e8287a2c2ae420bbf1a5821efdcc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee316de727---lulubujo.pdf In PDF document text
    • http://abaj.cz/UserFiles/File/tigiwugido.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/821633564.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/3ec602d73c5af48cf88e29784f9ecf1c/27840674289.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/54060654493.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3jpuu9na10ophp99gbncnpddr7/zitosiguludagotuno.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d5e4526ae9905dfe4ada0620f8e7521f/pedokijolu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/55910587097.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/taxuzam.pdfIn PDF document text
    • http://cycling-software.com/files/file/66845437375.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160741aa6bbc9f---dagonugojosavidijezase.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f211928dc---38665491451.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/pibepopibonisuzezugoxo.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/60405681910.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/31566622222.pdfIn PDF document text
    • https://vpmemorial.net/images/file/12528228907.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/1786446925.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/34352491533.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085d951cf95a---43255406584.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/89886530865.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/77355868319.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0560c29f7---40062837036.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49265631484.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7260f5c8abd5b69b3bbf62e80f3882ab/28221718019.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7a71f9121cb264bdc125e915cbc3fe2e/purixukaveponidakoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=symmetra+lx+16000+rm+manualPDF 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_off0000cee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 10624 bytes
SHA-256: f7a53cd8e146526e42cc1a9fe91ac0a4f01476a1faac56afd13e6fe5a2caa7bd
font_02_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 17880 bytes
SHA-256: 37d80c441439b4be095b89a738dd073f96094d317f4d51c899b1a7b5b74e1f0d

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