Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f344f2c4a2bc502…

MALICIOUS

PDF

83.9 KB Created: 2021-07-06 15:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 676a35afa2be5fcf67e21cea12244235 SHA-1: 0cb91dbe4989287e5951dd7f3a321cbbb2e66c69 SHA-256: 3f344f2c4a2bc502a213b6c561eca24739904b7ad1766dc094bb4bb98c50fefe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/170f378338416cddb91f59231cde108a/1994410630.pdf In PDF document text
    • https://alihuata.com/userfiles/file/wibiripezufopir.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/85881401701.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e0nt65epehupou2t18omp7it54/riminutonipopakodixese.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/32846450733.pdfIn PDF document text
    • https://bamor.org/userfiles/file/pazifedagikexegepo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/af4cccb580ada054a6e1e9614b817f2b/rabexomefusetugo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ebj6t0pbe79lr1dpbkia53v8b5/24365751710.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3066ad6a---rewuzawomanoke.pdfIn PDF document text
    • https://premiersuli.hu/files/files/sodasuwimatevoxo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/22997768997.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5ac857fe63dd23a5c45684911ef34782/juroxuvepanikitimixo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c3cc2082cc7deed3a1ce1b8e5182cf3d/93499344410.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/71055367622.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe051cfb7b---10851888811.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160748050868c7---95674942566.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/favofa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/40586ca56c9e9ba96fdd034fd16732f5/gapikabesozil.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/6871417031.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vnlfhklti129qq1vib1v914pdv/68040713152.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1411356683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=answered+prayers+quotePDF 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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 17292 bytes
SHA-256: 49fd7d767ff58c8523f64dc4228e74eaa2e67de0137c864b224334971dc7215c
font_01_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 10676 bytes
SHA-256: 51180cbabc124052ec96181f5029ba48bafc48998e7779fd99d4d35449d8a9e8