Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bea60856fffa22…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 12:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c9adaadfe42bd63092ee3ebd1a45ce16 SHA-1: 3aaab97f7812fd7ca3ec051435a8aecf81c01896 SHA-256: 88bea60856fffa22ca47f07ad0205970c48c2e820d0e1cc0c0091dfa704bc66e
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malicious content. The presence of multiple distinct hosts and the use of disposable hosting indicate a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/993311a0124234b4eeb680d1ddcd117a/ruxifaraxuwi.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ieneevl9sitjn2tvduq49ao1j7/34600890331.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/36e6704c9372427b67a4c9bd1d9ee034/30820749703.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1623759691karisobozevusa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c9f855548d810a638caf17a85db6dbdb/58253139124.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9cacd758d---93419840781.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608792f8b5ba2---88310232831.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/gatepuzotoraxodezifedipi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f028c1a110---rupurujesepujifi.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/58645396179.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4f0b035fccffb0f1301e8a90cbdf1e2d/2268588399.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6041150b8a9e22f4e2a30f1520958629/33579078832.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17d8d866f---16843923292.pdfIn PDF document text
    • http://talleresjpg.es/img/file/39333134929.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/uvp77ioh20v190n9h4sd2u528g/fijoponikawofi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fukotenazakiredutozaxe.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3aca02583---gidikejutapavupifazi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21e7ceec1---10538171219.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/4156906654.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/19085667948.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t6qq7abirrucdbi5sk0s2tkesr/53951091262.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/73598278121.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mojizoderibe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc143497---niriwabewitipubikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=clive+lewis+narniaPDF 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_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 16780 bytes
SHA-256: df32f5516ee6dffc37baa2574a066d52e8082c023d216a2f6b2b2cda41383cdf
font_01_sfnt_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 10068 bytes
SHA-256: d1f190608ef893dba967af353f4a040f783ff903f57f63b7a05871325aaf4a7a
font_02_sfnt_off00015322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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