Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfb429e4df5536b…

MALICIOUS

PDF

81.0 KB Created: 2021-08-29 19:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fa05bed38fbd7c85f2a175351e236bdb SHA-1: 7e327390e4b027aee14b012486d5f4e3e87e2ab4 SHA-256: 5bfb429e4df5536b6136e0069c2ce44442503ba3c083e199559cf88709095c27
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 a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, others point to potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e501db3eaf---45694975378.pdf In PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/13404109857.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/c4fteak4lvc2slfgeb8uhtgp3m/fenuguribuxeraku.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/ruwenolu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/78161854940.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/gipuzas.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/18358963031.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/plham69hr4f0p70spf7kq51b3v/21824102156.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4eab0959---bavovu.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/bazefunimusaj.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68810a3b0---48507601554.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/mufusinajawodegi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/jexejef.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/fb88dea4c3ab5b62017c9a0b0706b0e5/28129700197.pdfIn PDF document text
    • http://hotstamping.pl/files/file/11578664312.pdfIn PDF document text
    • http://vejwun.cz/images/47925106613.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/sejabamolenunewozifebam.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210728001108_69rx7y.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/43045389510.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d920304147---zegegugulobisezilurinidi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/358d33592fbc2aac7e7330936b1aeaa3/91058968572.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/13944396285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=milgram%27s+research+on+obediencePDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10888 bytes
SHA-256: 3480e41a3d5ef1dcf6a5167d4b96d1dab87ed6ab9df4dcfee721e134a628f224
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 18064 bytes
SHA-256: 26295b92f6919877aafa2ea28b5fe2f9447112481f3a6b92644bb7fb56ed41ea

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