Malicious PDF — malware analysis report

Static analysis result for SHA-256 a422d5ac308e3563…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 09:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d120e59108e8f87c517704171583790 SHA-1: 88045b75437b66d24bb9d6a44455c839263a3ab8 SHA-256: a422d5ac308e35632f5043f86c48d91a49ec54992799eb45527ad26a9dba0ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a 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://lesfeesdelhetre.fr/upload/files/fupepevubegeg.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1411053272609e5da479b19.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdcbf03f4c---69951024272.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/dexiramozuturemasimuroma.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/89096730045.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300ec3ea7ad---17537798907.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c121ad1ed6c83571bc1c2ae7382affae/kosikusavamareteb.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/vuzulepemekubolomuwetofed.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rr7koegv6ahc7um7hmi1jr19sa/79272551682.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/67913943908.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb3f47fad---nesuraxuvogop.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/977bde7c8bef72c106183f287cc36f48/segetevetaroxovibe.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/jikevovujefaboxo.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/76484817786.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/76286935714.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b308c77c72e15c0ea4abec4a285d5f23/81994009479.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e174e576d7---lanajepigapufoti.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/60415933471.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210814014335_346518.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/mutodetinim.pdfIn PDF document text
    • https://posh.hr/files/tametulunorerurazaba.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/98184252459.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16100f5baf3b6f---64617623040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=photo+to+pdf+softwarePDF 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_off0000b7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 15856 bytes
SHA-256: 94553fec975c0d20dadf2e8b8e6c13c8cb785c6d7db1dcee29f3dd6b310a7d21
font_02_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 10440 bytes
SHA-256: 94e7aa77a44fdbaa14be264f5dc85da1a6f9c1ecfccfef0a087ca18fbb986ef6

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