Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbab607ededfbd8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 19:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82fc463ab336c35308298206322cb5bb SHA-1: 7e0178b9bc8d34e322ff7ded9d574e25e4c7f05e SHA-256: 3fbab607ededfbd8c16750c1e7cfea38da163c3168193d5702361f4e638ec609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URI heuristics and the link farm structure strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allasclub.com/campannas/file/47485593186.pdf In PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/senerakovegivomokutufo.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/dibanezanakasibata.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jefeto.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/4175774622.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/60237993296.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/60231118067.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/10886922277.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/792465860.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wavazakapojekademed.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4130f428---guwivo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kmjm8scu9ep1j0m6uqhccf4qb2/57362223926.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xefefefulaxedulexa.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/wuwerulipelil.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/23197813096.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2cb33598c94120646f43bcc699a64108/tapapilorawogomuvoranez.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/rajemogijokegolepo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141471069c21---sepiximujalinufikodak.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/23847931834.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/jofixul.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/47471439123.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mawupalavutidak.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/todunafojugi.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/pobubewi.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109010723187574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pubg+live+wallpaper+pcPDF 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_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 18356 bytes
SHA-256: d6556d42545582c402d8f85945178bf0b17f4053fd1165cddde7f07f9637bcae
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10452 bytes
SHA-256: bb807955e59bc5d082ae9949129555b5d5bc22cb2a23a8650d36901fd04a3205
font_02_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1