Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab81cc19fe235ea…

MALICIOUS

PDF

88.9 KB Created: 2021-07-04 03:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b9b3cda978ddd516fdb4acf50159da41 SHA-1: 02ebfa8791605deb0f8675ad536efe805ca1042e SHA-256: 5ab81cc19fe235ea4d6de2b998f11bc3bfd89fc39b4436e04bade0c1b3b0a881
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ff371f8f8cfcca252cf044de8398027/xukorobexipepozevupejofi.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/597275a499cd133b5c670df45ae26141/litorixufeboruru.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae74bd57787---39193502398.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/18a4efb5137777b72d66df799a3f9186/61993295339.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a0ifaatmetqnte4ntfeuefciel/doguvuboxagolezozuve.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/62141581401.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5b68f9abc34e3f2365247bbc7f271233/pitorasunejiwozolek.pdfIn PDF document text
    • http://congtyvima.com/images/Download/6459834913.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/vudukaxomijilarosuw.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/tiridesimem.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffce13f6e3---kabuno.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b057ad31---mizurixigiduvowomof.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/joguw.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210612182512_41dwdg.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b07591681b---lolubumevet.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/573497110f5480fff537b69b3d5658fe/67617634510.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/ritomigegajodadiwojali.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-22-16-37-32-17.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af96aaee120---tisuketidepomojezedoxu.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fapejavewosak.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4dba07f0bce9941c7b3b91300e88f954/31229067596.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160977239b3a9d---83236469562.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/59289368992.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ec839cfc6d362c7043d62a978a38745b/25342631069.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091824c1f9f6---48779413030.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/50591a0837a2254ae329046af607bc2c/15411252248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=political+map+of+india+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 10700 bytes
SHA-256: e423803f34f8d6404c081f405ac16d3c1fa069350a5fd39527964ac9938b7a92
font_03_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 17356 bytes
SHA-256: 2193e435b1dc4ca2221e574a6a618734c66fd1b5864536748d685e7a4b404ed3

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