Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ad99f787b6f8d0…

MALICIOUS

PDF

88.6 KB Created: 2021-08-04 10:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8a022e8ce4eef115949ac2b92bbd6d8a SHA-1: 8904d941ed08fa86e80729cc88103cd1888001cd SHA-256: 59ad99f787b6f8d00575dd3c392f9308ec93767c3121f9c64d0f4d5276964962
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=fashion+nova+customer+service+open PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e58f11f3---taveremunuvixabekojalil.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7eadf2bf286460955f9695c4b8b259eb/fomigofagesinutadesusi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec55698359---83035857629.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/80344762846.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f13317370---76540465815.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/1685534147.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6augh4p802a4tiin7h1rfn49o0/47530758168.pdfIn PDF document text
    • https://tsegypt.com/file/13508698186.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d8f708d6d46fa1c81e45729f4648808e/zemedigomal.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/10315837714.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/429bbe8b47b617023ba29d3d3544c5b0/putifiwetal.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8pu8rf32s245u7g06dvn7fn1a4/menupivis.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/newolemenis.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9f337c2f96523ffb2b2bde58b236dce4/gebigidepagamonulax.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ktjattqffjvtfl5e4ss9qlod34/50232951798.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ffe680c2a1946ba3250310163a5e2ee9/dajurifadused.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/pagojiwi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ceec52f14---94194239386.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8533046d4---36963617159.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/lekugirizelobi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mumojebireb.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/tesikojaniwebevegu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cb1f411f5e44320010e5ce8d8e50285b/55428150135.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/dozeziko.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_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 17888 bytes
SHA-256: 9deb6629ad104ed8465d5072ee495a909f90dcc7b67a50fe8ba4e2b56e516361
font_01_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 10736 bytes
SHA-256: 50ada8a2c5dd45162e3e0513db1412f2de4ad105d35f4a66832cdc9a37361bd5