Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1fab8367bfce72…

MALICIOUS

PDF

76.4 KB Created: 2021-08-13 15:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c8ea9bbc253187d79047119cebc460f6 SHA-1: 56c479994826b85b45ebd94e57acfcc4026c00e5 SHA-256: fa1fab8367bfce720d3bce567b76069f74842d343f6bcd7edca413e2aae6aa63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=genie+garage+door+opener+wireless+keyless+keypad+manual PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c9cd2131e5c7a4c5a133bd1db60a2ad/67115341071.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1879602ce4---44558436118.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/wisorojesikozikiwase.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/89802907184.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diginexivenubidudutito.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/53kfdfrbc0a47qstnc13rv9bdt/26028657142.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/lidabaxotite.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zemebojafawagon.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g90d2o3c19cd184oeuo7nsfusd/zuded.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5jhir24476aocl7iql77s7da24/jimepisulewapud.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/pujesekakaxagilax.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ca2n19ku5r0rkj4oh9iaiuf2k8/85491786679.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/50623049463.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/210385714060a657055303c.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/338591628.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/eo9diq6i72bo7tkljcr8i0mgfk/75113746054.pdfIn PDF document text
    • http://epmachine.ru/d/files/16796243722.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d981022114---11916551568.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/lapaxub.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/11082374869.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/gakesetegaj.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/22773213819.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a6053447221cd1514b5f9fa4e68e23fd/zigotebumav.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/6449549760.pdfIn PDF document text
    • 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_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 11068 bytes
SHA-256: f0f4293064290e476f45638eaeaa05e472719ec1bc0a2d3f4c740a47b270a841
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16056 bytes
SHA-256: 7c277cd206d2fcb7afd8bf24c57389f8c0d0d5813c13276983b25a61c766b1f4
font_02_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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