Malicious PDF — malware analysis report

Static analysis result for SHA-256 1671a8579a833538…

MALICIOUS

PDF

77.7 KB Created: 2021-06-29 05:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eac63d88dfe61f2e2627e8a140681d17 SHA-1: 57c14632d564e89e6d4f4da5666fb0718411398a SHA-256: 1671a8579a8335388ee0507620b7a93c54162796c7d9d789a5430b3abd1f0056
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or exploit kits. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=manual+for+ultrasonic+testing+of+rails+and+welds PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/32529de5944c66c530bc22d2ca13a2e6/fazerenofodifobirixasaxiz.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708e758a0b6---natunidufelufopo.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/vitapalod.pdfIn PDF document text
    • http://amdind.com/userfiles/file/4444802658.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/zudomafugefixotelon.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e387195bca---61861036443.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dd7599c89a371fbc5283ef8e3ffaafa8/84038699366.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/5748752201.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/i84kp5nkkg77i5jvcab7rjajo2/93880550706.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b71a36545e---fuzapogorajugodakazum.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c9bf01e521901b80437fdcdf32afaac3/sosilesimivixenavozixem.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r8o703mqo05fe7h5le02soikii/13496715141.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/87464265293.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6602181800a9adfd52e879d487952260/turuzetilopalizanoziv.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc91753015---62492212961.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/pimamilaziz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce68c478399---84676254075.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/79482165675.pdfIn PDF document text
    • https://davaocarrental.com/images/file/25649433301.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ccd38fa---69694956167.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bcb554b1---bitubedugiduj.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/80b22d11633adbf334c45cb0dd30a836/21655422423.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_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 16396 bytes
SHA-256: de740bec14434f52d399679fd44fc2c5b920584a2a503b2694981e7d94b7e3ac
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 10832 bytes
SHA-256: 6735d4dd61a90f3bce8bc5879d531033b8eded4043236ff28bb9b674f4448e4a