Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1911a73af807f54…

MALICIOUS

PDF

83.1 KB Created: 2021-07-19 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d274a812845acfce2811449954d5f22e SHA-1: 76e4a7b498b33244146123a7327d4787b01f8505 SHA-256: c1911a73af807f54406cd0911c78fa0e913a9fa10562ac387a25dbb0c7122681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to various websites, many of which are hosted on compromised WordPress installations. The PDF contains numerous embedded URLs, suggesting an attempt to phish or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/93360b37dc62db40ea3c1f0319f353a0/51873086302.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fbe5e881fb2089ae5d9eba22de09089d/zoniminizojojig.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/72360413578.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/punotejozizopamuxubitusol.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/997ecd84936460cfbf4861afbd8aae5a/nakepamirafawunogajuse.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210605005023.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/52870520315.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/36705336340.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42bd5aa83---kowetarazotu.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/64452987563.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/687152f571e2354d61b202c5a5495e0b/75436518997.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c186c3de09cb165984ae133f57c0724a/kapotulogigidutizidumoxu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cada7c1aec9---ronote.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c849ba157c---vagodikixe.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc442b83e---56986162179.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/coi3kmb3c04hi902i50p2qe0pg/zoserupatumemegadomurepef.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca8c744dcb---2685845094.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/liborirezizumibotivewesov.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/56247260854.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/020701287083.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e70955828ac03ce5e4f88760aa427bcf/vuzukefejelepomapa.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/44108607233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=9+month+old+gruntingPDF 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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 16368 bytes
SHA-256: 3dd5be0ae6c3e7fa6225e25a7b944f84924f68e40d2bc298dea4df9ba3b2e170
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 10404 bytes
SHA-256: 70b24ad11c4e72141ce97cc9bff71ab9c06b0247d00c122fb25e7aa9f7bd33c4
font_02_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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