Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcbaa061a4c142f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 18:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ae89fc43fb6a6c6dee7b86674cc27a4 SHA-1: 898025c1a36d6f615b610cca2146f876a7bdc3b6 SHA-256: 5bcbaa061a4c142f3c958c32aa339da232d217dd9d251244a9caf79f86ab3a76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=vlognow+for+windows PDF link annotation
    • http://lesmashclub.com/imgUpload/files/67799319107.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50b6606d---14676130192.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zorubafumosafajatit.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/65258852704.pdfIn PDF document text
    • http://rjt1.org/upload/files/tuxewejesagovugilawaseju.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/84158811855.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161399803024d3---38823072408.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/wegamijonam.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/76231414763.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/67050581004.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/vunawolevemoxowezirewum.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/nuzanamunuf.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/59275723651.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/pigowiwupobut.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/9455981369.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/radagasaseku.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ettn79fqm589qitf1deults16v/zaxud.pdfIn PDF document text
    • http://rrarental.org/upload/file/59904820670.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2975175838.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/gikevunagukowukewuwik.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/62134171543.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/81148989225.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/69900228742.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210903042909.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/zawarasojevakonafafukapes.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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10192 bytes
SHA-256: 47b07203e68cba150fe944b064c8517ba1d791f4b72fb0346ba418e6a1532634
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 17176 bytes
SHA-256: 1717300b446c7b7847f0e7f52a42aea4dfab7e11b3958922ae5e319fd7a0b0cd