Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5e9cb379d80d3b…

MALICIOUS

PDF

95.1 KB Created: 2021-07-02 12:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 74096a7fb8c03d50a560e86c0d89c75c SHA-1: 045aa2e21160071ed6a34dfb06fb64c68206f031 SHA-256: ff5e9cb379d80d3bb2b401385e1fb894de13ec2333e199d1dbad7fcfe843da74
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://medvor.ru/uplcv?utm_term=meaning+of+the+word+ebenezer PDF link annotation
    • http://micronforgacsolo.hu/UserFiles/file/45485094565.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/696e5hrqfejpkc3vmqbb5q3fic/9570612254.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/fogibudodozojamur.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wovukuvoziwexutaxazuzof.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cefb36a50---volanibafowewujaz.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/benugefupararufobevubego.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zemin.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608518121d224---dipewuxedapo.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/tokulonivujojilisajerib.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/zoborafeguva.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/widen.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bebuf035tod5hq4e83eon1jhv1/72248775190.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977db94404a---3100862230.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/vusirekobupigarovuwu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/evbb7b2gre469jmj3n14ssgdl7/powoxukifutixutago.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/foketekukelotumuv.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5a1a374c8692f3c470171fde0d07ef60/letupowotetiwin.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hpla4r1fjlf9d2edp36q2vegm6/kagimitiminizowururu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/52535748300.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/pbeu40aeacfnut59fqcoqkm0fg/19921817349.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/jipotasufevuza.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210626085600.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/35015352823.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/werodirikono.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_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 17380 bytes
SHA-256: d1c4310c23e63a1a8a7835c83a3c67b9c4f7f883e38d3857af65c33eba89af7e
font_01_sfnt_off00013f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F27 10696 bytes
SHA-256: 4662f74b96e1396968fe1346678fa30be94cfa153e7f67c184d3a287ef225211
font_02_sfnt_off0001577a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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