Malicious PDF — malware analysis report

Static analysis result for SHA-256 57db4483f05b7477…

MALICIOUS

PDF

90.6 KB Created: 2021-07-14 02:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d02533c02adfbf16bc04b41e6b0e2a5 SHA-1: 907a322991ee307578ac128c12836f3cd89a14fe SHA-256: 57db4483f05b747764ba0ac8b6e83ef94feefb63119be07317ae35fc310b1f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=best+free+technical+analysis+software PDF link annotation
    • https://alibabaoman.com/basefile/alibabaomancom/files/62755508368.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/29683334956.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5651fbac---lolamizuletarijakejosok.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pijikopitasobutexusova.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/35574700491.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/52172838282.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l7o4e3849ie6ngn44qufss1gv3/savubasawaku.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/76304607192.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/mobejirilub.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c3b5876b---61861892023.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a1ac3f78---vuzesatoviwafafigab.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/mlkqsmsssu9agrf9eqg12qdabv/gonid.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/duposuvarexulevemome.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49eea8a57e8fd4dfcbcf1926a96b04a6/90269952344.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/31264549283.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/vafipomonunozifazevola.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fimugugexuxexizemat.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/fosotaguvopadowa.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084215abfdfb---30215821259.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/fba774927dd55cd1b1a6f3954804eca4/xepepanakez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b630fbce6ec---xumetevoxetofupovafiji.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c5de1fe8---98851713761.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf55e77ec---tovifidadageluxavoxumuxik.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 17924 bytes
SHA-256: 2fd87a52d7468a627e23966bef7fb18bfea3c61c818f1e69ed7f466bd8e4ffa4
font_01_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14478 10684 bytes
SHA-256: 716d0604895633e23df5ca37b821f78d34d431c4ef68a248140c539ed08e4c24

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