Malicious PDF — malware analysis report

Static analysis result for SHA-256 717745d9439a805b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2db95a6b31b46ae74c5e6200b3fa5885 SHA-1: ecacdc8789ea66a3b1deace0c93cf663c7b69625 SHA-256: 717745d9439a805b7b715e3573087ffe856f2f4987f406330c9d07bc32617735
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bishopsalamatkhokhar.org/userfiles/file/mefidagibufi.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1ce3cead---21650389503.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fdc6fd316b5047af696bc5c332910e35/kewetogamo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb7caac3c---51715575292.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608718c3db178---51325857436.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/99366823727.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/db83c4020b9fe0fe1212faf8b04f57a6/tajol.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f745e4e05---kenebiwilaguraduzovuza.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72937b85c---86882874385.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/79218231acfd51d80e94896a9b48f358/30249223085.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dc0b263da2d5d8d7208b8e8c20eff923/64889762245.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nisoves.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/kimejisowawaxebux.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/d1nus0abbrecacbiu3pu965afb/20468501339.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36870606153.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/e147874c5713d757e6275974fd9f0d3e/87612643817.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6ed59948cf9c56140ca1390a0e4471ee/36976275321.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e1f11a49ee9eb27fd713bea4cbf60f6/19229553500.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/504a34c82145c2cf649e1c3770ef0f8c/75791895479.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5e9caac039f7dd3b17211f76bb9fc941/95850828286.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fab03baa5---56830250064.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/gidofaja.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/533feacaa7552796031a87fc4092257c/rodopasujiwanumuwamoruv.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/058c03e4241910f03c423ee202b758e0/37354957994.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/zebimowetujava.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e8f2487b5---niguvixexabawijonugipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=district+attorney+larimer+countyPDF link annotation
    • 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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 10608 bytes
SHA-256: 4bff33985131c99c0147bced0f2286465ff7d77024be9939529fc35e6f1fef76
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 18376 bytes
SHA-256: 5d7bb508bd91fd3e06d36f361cb4f686e99bae8384cf9b610a4bf3c605d773a5

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