Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2ddea959fce733…

MALICIOUS

PDF

93.6 KB Created: 2021-06-29 20:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5229a70d3b8daa0e0e394f372f073ca SHA-1: 1d61421b908617ad160aed03e299c6d64889ee0c SHA-256: fb2ddea959fce7334a655f2d766c3cb4c005c61ede2adebcd23b30a76dcaea7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3bfcd3a5e28f498fe05f7e1dc621fb0/dofuremavi.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f45aa7ccd48e8c55fc3472579cf08dc/6694585525.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c22772c9---gokubobazubigano.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0468eb959---27618452405.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kipogatifejabuso.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/13281536891.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a5bc896ae0a35655a93ee2b1c4434a32/8739514355.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4035a85886e47271c3af6cca97a8cd99/fenulifolawutubumokebibov.pdfIn PDF document text
    • http://plncse.hu/php_data/file/87257018397.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kqc55lnud56g21flssaq49fvh1/matosotarubopesolo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e881e8f8a8---57138457807.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/88989807679.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/1196221342.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1c4b74a1---80831173670.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b44b9cb855c219aa45da4e1a4083eb61/70723117090.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/30341673795.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/20213960146.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/73b032737aff454e6e1b3cf37585957f/28172779939.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/15831237363.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0ca6a341b6c5f77a7bbc98ab1ab2ffaa/milafoso.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/81518004461.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c548bb611bd001fdf03c0ecebfcef392/5865566414.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/76851138153.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab8a4b55c5---bunopevofemedo.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/72416058788.pdfIn PDF document text
    • http://gtshotel.it/images/file/38714317315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=s8+icon+packPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 22932 bytes
SHA-256: 93528d945aff06c68dfd8522cbc113cd131f61a7013e551932128222dad432dc
font_03_sfnt_off0001507e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507E 10196 bytes
SHA-256: 44c2b9412c75047690b066a1587e423c334df851206f39d7a468c05a47b59458