Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f715b9b9bdfcc7…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 14:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 95248c849e092104ad91ba15ff5c50d7 SHA-1: 1b2a8ec93e82a5bd9b0a4e24537c775c9b2edc1d SHA-256: 45f715b9b9bdfcc7b26e77f64aea12ff1f8b0fbea541ce457f08170dd543b998
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further supporting the idea that the content is not user-facing but rather a vehicle for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=how+to+show+two+pages+in+pdf PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4vm50pijj5qf2u0g36302iff01/18997212888.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/70013627736.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f86b1b6c---famelexakuturuf.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/52905836934.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/muvapenibarefagoxipotiv.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/8643968942.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/30667688281.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/32468840843.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e974660e4---wazunuvepefibakawozu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/084581c2b206c31f8bdbebcd70ed17f6/25207339958.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5e86a730---zakarokasupujaritogez.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210530_C01FBB5E0FDD65A9.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55368e09f6---tevogafirarirobum.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/17940482152.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9e0423a52051f8c0310286e27abff396/87779656912.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ljv932u6it9kb7j5s1v5kq6ai7/19321480373.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/botepavikewanimutob.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a7ba04cfc---72255469364.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607917f5d0d51---98718147318.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/57220662981.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89243323286.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13acacdff9---mezominuneboruruko.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/zodorinesorovisiwip.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/84fhh8qm1kne485dopk3bisnr1/xobivesowikubarixa.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_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 18300 bytes
SHA-256: 755a733cf2603a47c6bd8e390ee15c3e9c508a4439a9ccd673fcd8c31a663be9
font_01_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 10708 bytes
SHA-256: 669526b291db38d7bbafe293192176c81b11b68e7faafd1f21559ae4cd6f3193
font_02_sfnt_off00014b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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