Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58e6e43677a1b24…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 18:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d7b8b2710b72142671016f8bb6c9f9a SHA-1: d4b649ce1dac4bd8f0f9da3f65e5c5b49d2bc571 SHA-256: f58e6e43677a1b2461051d171adbb735ff60e5b9daf20055c33216e5ea104708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drisraadentalcenter.com/userfiles/file/wuwukalafuwi.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bfe40abe---vorazovarapikil.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/44626d5174b77258acf0e0e164e2401d/4231302509.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608784d43f48f---87800928488.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1587586524609638ed1215e.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kudekorodaz.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82673218895.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde05734b14---kebujapulifi.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dasowubegisovurajoz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/71219968004.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e3777e4b12bfdc4ac3d79f2d3fe31080/84022222003.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f922d9db6b---lizebexowirumifaku.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/jimilenikujananad.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/fawurakuxugoxosebifuzu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l6bc3e2v8b5jc3sct61id0gn0j/sesokozukorezezemu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zugisoxojuxovired.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/85837792379.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e5587b8d5dadc2331ac0e6cb3298f7a0/22729798316.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/povegudanupowurorijubakor.pdfIn PDF document text
    • http://vhz.cz/user-files/61645264112.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040c86acaf---44717321835.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b56836bfb8742879d9d4f3be0be8e3a5/44315153896.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/fivezozawozosulawes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=human+anatomy+and+physiology+lab+manual+exercise+14+answersPDF 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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 15824 bytes
SHA-256: e0904b4f065b9ce4e49d0159154b8603a59bfd73aebc4b289a3d06bfb4634bfd
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 11624 bytes
SHA-256: c48627a35358cbdd5117c9e2d328a9e85478e8cc13909f20da44cc0f6153f4da
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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