Malicious PDF — malware analysis report

Static analysis result for SHA-256 1177fbc303484de8…

MALICIOUS

PDF

86.0 KB Created: 2021-08-05 19:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77b6bdfad475d6d3f2ebb7c573b36635 SHA-1: 2338042b63a495c75f8dd2e55a7062abcc6536ec SHA-256: 1177fbc303484de8bbf85658f55c14ac3d073578e66562c62e6b03a5b9ab6cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=rasch+wallpaper+catalogue+pdf PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e94c00374---35671455464.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/loxojupidujijukazi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/seforog.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bezulenarufuvakaxafum.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b898de25---74233764845.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f1aba1fe71---96912725607.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/nimiporurafurikov.pdfIn PDF document text
    • https://beaszemin.com/files/kipixuxapatosovadivarek.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/46125799340.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073785b081fe---pifinub.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/wunipe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7624756691fd40b4db1617edae0bed67/judelewovix.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1288165c13---donuwewarewuzi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/32836681373.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/godos.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tokizexetivonar.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff5056655---dikaliwup.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160dac42a4c22b---vogofirofolokodi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4222e536a3.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/79378970176.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7960d926af---53038173231.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/68390481973.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610945bac816e---54189639943.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u6m5gkbargqn814mq4jjtrg6th/vuvunu.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/gejeludofaguwetuso.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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 10936 bytes
SHA-256: 5f9e90c6c757fa4ec517f773f9a26c657b9bc3b49a77931b82166478b24a78af
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 17092 bytes
SHA-256: 25c492e4468b111d534b615b9155f6988f463c65f9a307d8542fdc28a2cea49b
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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