Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d43db8b9a65cb7…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b9495695e50d6ef25f6eb3c388ad4b5 SHA-1: f9b92a97fbd6024bf51891cbdb145a1c90e10ba8 SHA-256: d2d43db8b9a65cb7d30189f365459e86b3150f281e97bde80d16bdd29baf9b5c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://srsatta.com/ckfinder/userfiles/files/bavokifab.pdf In PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17208596059.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae4d7fce1---mozopeso.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bukuforos.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb54e38cb3---tigijoxedarogek.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/7934514455.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/70413910724.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/nuzudumakibiselexodafari.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/61335088543.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/93804613791.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2d7e547788ac75a5c3a5af4afdf58e6/wejimul.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/liromiputubekoxixono.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca92d70e83---32947963208.pdfIn PDF document text
    • https://manenshop.com/upload/files/11323903188.pdfIn PDF document text
    • http://webursitet.org/Files/file/xupemetidomazojelegav.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/sifebovupowe.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/bimafufojegavujulewoza.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b568346216---10267806278.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/7601995943.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/53e3e8b3751567552a85dc678a66c27a/74107860133.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/bovoxol.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/28835226636.pdfIn PDF document text
    • http://art-ball.net/files/file/55893652591.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuxolu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d1eb40cc---feninabujumuti.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/juzuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=3+types+of+leadership+styles+pdfPDF 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_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10680 bytes
SHA-256: 440830aa76651d1b3102db6ca97190bfa3e784af031d6025db8235faec6c5e65
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 17748 bytes
SHA-256: efe6b523220044738bf0ab4feb4453ba8404e4531849fbb7b83152b17eabb5d8
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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