Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea13756eca9a8d1…

MALICIOUS

PDF

87.4 KB Created: 2021-07-25 00:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e3c621afd88e8d21bc16a130c07f280 SHA-1: 4ee8637e3505f8fdce69336b23893e06e4a55a91 SHA-256: 8ea13756eca9a8d1ba5eb861fd920841d6db19b9bcbabfc77ac96d42f9f996c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0f280e51---26341895301.pdf In PDF document text
    • http://simonhoirup.dk/userfiles/file/koguvexokozufofojiwazemev.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zuwovumobud.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d501b4ee1---mewitawosus.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f95d8f2c---jibebedivarefowekuxudeb.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/foxagab.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/xezoxutaviruvazorak.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/78677123031.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/40217998798.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84760383896.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/48122707778.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210609_180120.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6d157b8bd9fbadd62797ea3adab977b9/mozibekefevatanelafire.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pelajoxe.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210706_01302B93B56A9805.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/95628536785.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/50752009421.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b2855a4b---27701791915.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/momepupodaremazudedut.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/oetl7r084mq2du237d0paimuvu/nesowukevufuperebagel.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/xawiwopuzikibebekevob.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d1ba1c1a1bc9d301c945c4e13e3313cf/11081472568.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42dcd46f32---sufuworibagexoxafinaz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1326c591---62026126124.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/n7svpu32u6nm7hoi0p0e1f4uh4/8707469977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+common+foreign+words+used+in+englishPDF 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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 10904 bytes
SHA-256: cafc739a142c07596066771a22bfc68cf8329886eba464ee0407d6632a757af4
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 18648 bytes
SHA-256: 29424b12432cd0d6129d864445d6ea9739e6909cb3e2c6b28c4bb0e392bc10ab
font_02_sfnt_off00013773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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