Malicious PDF — malware analysis report

Static analysis result for SHA-256 6806363834011812…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 11:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afd136fdf0c004f7ba2cb734dfd847bf SHA-1: aaef9ddad607049530e1e81f86c96340bf406788 SHA-256: 6806363834011812cfadc9cc2adc0aa8af338146db7db8e0950864cc73392165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to malicious content, likely disguised as a file download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://1tlstar.com/storage/uploads/files/52597813488.pdf In PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/85426998139.pdfIn PDF document text
    • https://maturana.cl/upload/file/lezogobesudezefiw.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/rizagufuzejuwutu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/95654590125.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/33403427337.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/gedizonagakemudorizobe.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/japodevokakolufidinuwunax.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/30638125960.pdfIn PDF document text
    • https://dacola.com/upload/files/4122801990.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fadesajekiluvadegit.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/raroxomenadafanubazitab.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/80738669184.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/juwiz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137bad3e692c---34787750533.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135b02fded6d---25874589950.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c170b4f4---11464936916.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/70181652710.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dc1f4bd0979682657df2a95b9da2fa4e/33288198468.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/momonexedafidebodumetatu.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/96912202073.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630860367.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/sufef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=voice+notify+apkPDF 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10336 bytes
SHA-256: 6d3dacbd3fb22ae6430064cfcbc06ed8e19827bbf99ad0d460cc32442ca56067
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 18356 bytes
SHA-256: 5b71947b2a544368b7899763a7909cfe4d84fd9781f5ae34fdac39f94cb88f71
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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