Malicious PDF — malware analysis report

Static analysis result for SHA-256 191c51db69dca7e5…

MALICIOUS

PDF

72.4 KB Created: 2021-12-04 23:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-23
MD5: ddfd0552320ef7c38aa13f10a7b13392 SHA-1: 75000569082b4c75607c5bf4af53c4d38837a03f SHA-256: 191c51db69dca7e57ac530a31c2d50e607d39a48a6563c6535c6c92960932a0c
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=skoog+instrumental+analysis+pdf+download PDF link annotation
    • http://www.cemeba.com/uploads/ckfinder/files/vodufivak.pdfIn PDF document text
    • http://195exim.com/datas/files/jojesogewusas.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/besat.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/64649836634.pdfIn PDF document text
    • http://citra.cl/userfiles/file/48726104967.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/jabereka.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/9b9eta54sj7j6f27f299mh0e9r/vefuminuwerulu.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/84127759298.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/87134247061.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16187c269270fc---tinen.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/powegunamezenugofulukip.pdfIn PDF document text
    • https://12waktu.com/contents/files/33559993411.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/tozitofagako.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617b423609e98---tiwurome.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/eb8611c97ffee7ba6751ea1532559e7d/32595009102.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/47405985607.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebezopiwu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4273d28aedf2c173e82f765052898c8b/33102891856.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/folekolubazokoxexox.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/tejafutupozun.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///33337639256.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/64351151294.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_off0000b339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 11308 bytes
SHA-256: a5941beecc37afa6de805043d2645f0e2f369662ac628f1a060a2a947f0b634f
font_01_sfnt_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 18644 bytes
SHA-256: 39b506cad51bdbbce9d1c0418ff961f2d0285828afbcc941ea28f0bf9eec20ab
font_02_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336