Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f4a52b3a8d0fb8…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 09:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a3f41bf95a79fd76998a4930dc1cb8b SHA-1: 9425f12fc3fb1e4c1fd0565169b0bf7ac4976384 SHA-256: 06f4a52b3a8d0fb89e5f6619748980ccfe758f3ab85da08ed54519dc38090ce4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but reinforcing the malicious nature through its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://dichvuhieuchuan.com/upload/files/tesajetawigi.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/84471668610.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/68422869609.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vitexaduxotukosuweve.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721907cd8dd---61973512520.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607357a639bc3---kabadini.pdfIn PDF document text
    • http://hanauhrova.cz/files/lulolaf.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/87002037816.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/damezamato.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/39155342999.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pegepawigenigufaga.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085162b649ea---pesobezimi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kp06a7hhqmu1b64hhjfqgvqpe6/42389159699.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0394796400---38678609375.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/13029245007.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/t5ir3fo5aa8nt497k0f9ufovk2/57268776906.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ed4iur4s1sdgnbi3e6g9elnnd2/nafedufofijewidolibaxove.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/38827506226.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/40322326266.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/42822990965.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/91990545658.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052723524716.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6c2b71b9---21872303758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+central+idea+of+a+rose+for+emilyPDF 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_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 10848 bytes
SHA-256: e50d90676b218c8a22aada3a54863ea4cbd38650854c26ac7b38d69a417d6240
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 17684 bytes
SHA-256: 1f21f4ec8604600a25ded8af6aafa3993b1c7e775e9603850a430efe2a76666a
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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