Malicious PDF — malware analysis report

Static analysis result for SHA-256 558989c983a2b096…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 03:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a23d76ed993b4d09b05abb94b85fcc1 SHA-1: 5979b3e3c4ec11c3c3afa26796464f841bcd92ad SHA-256: 558989c983a2b0969c12b8ce0a5b1314a650895c7e661962376a0bed9074606f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=medicinal+chemistry+books+yogeshwari+pdf+free+download PDF link annotation
    • http://21cedu.com/pds/userfiles/files/manirijiziwixodosizete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27dd5422e---37806168240.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc3406077---tukebafowaju.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/suvomubivifeduwogebekodat.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/830422d9e59efed509193c3009909b06/35056722309.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052717445690.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/91f1bb9fa949d2eb6da5fccdcba8e99b/bekenakabobupikowivo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/nunuxutuxajaxepabavaziwi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sewurubiriduxamulefunoda.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d40db49c76b---vilun.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/daripiluwo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m8jc0ffpsen64pq2u6o1leoag5/60995214186.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf01d55fba---vonelukuma.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/megaxizonamor.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/welamatolowoborut.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/3167487318.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa182d87c66aa11a578070471b0449b8/pojojutofovobofiz.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/birujerufevudo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7c1574e2f36ac824fc263e6ec0b61e5a/62735757241.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/s50ophcpn8vdgq67mi4nitfsop/9753469927.pdfIn PDF document text
    • http://navigator-33.ru/media/file/wubafukovivajusiban.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/62149098132.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9089733a---34218057325.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/medegavudisazide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16732 bytes
SHA-256: c55c09778f184061021c557f5e66e54b32c9bafffd6f6ce63419468e14ec112b
font_01_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 11492 bytes
SHA-256: d30df7ca4205ff13c1f295206db6a6def031af9fc1af9d30675d4e1b09c3fc35
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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