Malicious PDF — malware analysis report

Static analysis result for SHA-256 a876d10051127775…

MALICIOUS

PDF

103.5 KB Created: 2021-08-13 05:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0c28465e1c853462ad4dd65036f93255 SHA-1: e61a5a47798abddec8723ac577c5c41a2879cca4 SHA-256: a876d100511277758dd4acfd3e948e5cc4449a78f5407826d716f8123d5a971e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure suggests a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4cce6b89---fixiviliwopevafisuter.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o7g56tjh9karm9d64nc30fj9rc/puzulodorubevegawutip.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb46a935fd---vuvunuvipowufogago.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/gujamibivokigefadu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c778095840e5fac9b43b95433cd1915c/26952665850.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e124de05960acff42a8df3895e388501/52011226012.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/29887771726.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/sitenalalowosureka.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/6ccf5ee8f68b54996515151a4f67875e/dasetagosigotimosut.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37051b521c---vutakaxo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7391ba8a1866a1a32055cb03d207a543/5680129494.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef0318d1c---fododulinaferawo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0be5c3f62b8f88dec497f1989fd0e35d/35891144838.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217242128257836.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fa5gom6a2fbl2hujcegj16pmtb/21942768019.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa626abdbf---bovidivakilexabuxa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082d44dc83c3---31120514960.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/tajefobepizaberumoju.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/41870237275.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42d665f3de---37150628284.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bd3738e1---jalijuzisewo.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/kufigavekanonawefirive.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/70666834986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=arduino+language+reference+manual+pdfPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 10776 bytes
SHA-256: 71da84b32e929a7e2554b6ce37f9dc6ef4012967aba41fd0a29e0134a0c24aaa
font_01_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 19744 bytes
SHA-256: 655135f8fcdff3dee374d507b3c622785fb77728330654568f24722a64f2a5d9
font_02_sfnt_off00015d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000175ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AD 16960 bytes
SHA-256: 6c1094ee59c9442b031c066e18128964e3f0f000dd76e55b612b7e01f1123df8

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