Malicious PDF — malware analysis report

Static analysis result for SHA-256 8475f52ee4078b86…

MALICIOUS

PDF

93.3 KB Created: 2021-07-17 23:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 435a1e54bb40685edd7237b119429117 SHA-1: ba2dbb840e4e1c63975614b40916025cdff7e80f SHA-256: 8475f52ee4078b86c4d53a70b97bc24d8d5d9d5a780040ff3fdb87ba769cd66a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, likely to lure users into downloading further malicious content. No scripts were extracted, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/zibalol.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/gudexitaxejedazupugorupid.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/kobomatadufusefibiluvi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e63245c99c0---52717945089.pdfIn PDF document text
    • http://immopolignano.lu/images/80393133879.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88ffd0d47---vuvuzigasupinaxaf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f5644333---mijifirezaz.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bagosawutoxaji.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/c6ffa582e70f9f97832bd37879d6817f/2272196551.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/80dcd2fd87470669b69e9d152a43b061/dosojezuxefadinosesomizi.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/11684008099.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/57506345921.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lozumazuxuxowevet.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7782369a80---xugegutivosimonumigif.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/gugazemebutukemenu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9d15ab882e75cedd4ecc9c91c15d4dff/48995099927.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd1971d49---jukuro.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a36dc853a---nokerubinegozagu.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/kategasanoj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186750923f---81512461167.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/62278432878.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b77c95c4672fe9f0a3d6f37dc671bab5/tetotebukesesidapel.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/99721972240.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/pukerukiwidubegi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/be8524a5c3d224cff9fe0822315cb95f/39818969134.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce086c784e---36038058269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=largest+river+in+southeast+asiaPDF 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_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 18016 bytes
SHA-256: ad1c8aa20cfd6b4b11f4458558d4b1ea0064ad6d960c35293dcc67b48d966d1f
font_03_sfnt_off00014f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6F 10464 bytes
SHA-256: ddaff979fb239baee465a0adcad5809c9aa803abac94fa25ab0d2d3156de220c

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