Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c3b21e19b6b357…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 17:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dd97e07206b014b0dfd2a65c518dd11 SHA-1: 4971fdca33b17920d673dfed990f82d456d308bc SHA-256: a7c3b21e19b6b357f5bab48f4b1cdf3704f6dd7f7de9959c478c68771550d16f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ediljolli.com/userfiles/files/74733842714.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b7e00a038740871b1583f92a051fe873/55670679850.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/28697517860.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/18235793735.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/zosutekaxunelijinejuzugun.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/71932345726.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/zatuzowoze.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/nitubebusaw.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/72144662390.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/buzivetogup.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/54284337065.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/foveladujidav.pdfIn PDF document text
    • http://ucokampen.com/media/files/13501511643.pdfIn PDF document text
    • https://clickbox.ro/images/file/31050577993.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/71453341923.pdfPDF link annotation
    • http://zagazzo.com/userfiles/file/48062471207.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/95853666752.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/34991096600.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613126a63ddac---fozunetuvekevujerewuw.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/suzevuwurasamunujamew.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc84e1821---wesubozuwoledudadore.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/32385799541.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/fokurota.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/071e2b9ed4913dc16424f6187a6d7cc4/zonipijixanemas.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10072903703.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/niwuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+i+tell+who+has+viewed+my+instagramPDF 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_off0000b2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A4 16072 bytes
SHA-256: b67be12844fe508dfd00a9e61261c6579663e72d672137bd5c8c5c308e273557
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 10992 bytes
SHA-256: 75c87763b8693bfd9e98cdcf93709d3cfe24bc9157d8c39e2a95b16b223cd82a