Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8654b0ddd27097…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 02:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c72332bfdf4e563d9b3fa1219915a27 SHA-1: b1aa3aed8da31b78d0c2c9755e819cd2ae88fd53 SHA-256: 4f8654b0ddd27097338b626ed8abede56b35c1da76f942006458dc9ee13fd3a7
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, containing numerous URLs that direct users to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be to lure users to malicious websites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alutat.com/data/file/82711814138.pdf In PDF document text
    • http://bielwod.com/userfiles/file/givevu.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/porozadawuriwi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/92141569602.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/565730c5349b2ad8dca3590e314bb84b/74833207039.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/nizosofaruxewasaku.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/45262141226.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f0d1dcbb---515470246.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805b26f1b6c---93639336098.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ce2116ec---92069558555.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/15109062627.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/jozivulaxixaj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3ff70134---sasuxanuv.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/20755404756.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/menutebikerudizamamuv.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7c63f61cf70dc1e3249437d50d149315/85494994546.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/29944424388.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160885f04c0f6a---38620939971.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///60203189180.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/28977122535.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/32588525697.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/94492586515.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/56022093096.pdfIn PDF document text
    • https://coatielectronica.com/files/nikakibivibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=integrated+chinese+level+1+part+2+workbook+3rd+edition+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46A 11576 bytes
SHA-256: ce50c0ba894754d56dbfdab2bf99accf6b2938a8dd62fcc588b320344befaefd
font_01_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 18852 bytes
SHA-256: c22be0c73dc3aff803da294dc943148759189e2b918e90ac2daab753077b3a9d

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