Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c8c27a2c727481…

MALICIOUS

PDF

95.3 KB Created: 2021-08-28 13:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6dde90b0f5eaedb86bcd7d10c2e8f4d SHA-1: 91e8de2a2e6c328621e7cbedb735ed3550520873 SHA-256: d6c8c27a2c7274813a22ba2cd495a611036cc8960657bb73bbd74752cb558735
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://groupburuemas1.com/contents//files/xaratoditorotulakovogos.pdf In PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210605_7A9CE91D482776A5.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/18342630151.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/58391986826.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/96096367390.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/tudezudavubawodefofexas.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tanowew.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084463b535b6---wawolewuzulipedavof.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/98578661508.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zexafudogixapovi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108182253566315.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf5035609---36075040207.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/bemirumuboragatefub.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/fegudanekipap.pdfIn PDF document text
    • https://diphong.com/uploads/gepejumegef.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__611D30BF39F04.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/646f922fdf4951b9462a0e1c52cc7882/92169963936.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a640ad118fa---jepijotimejowe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b718ad945fa---89573456844.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/tiviz.pdfIn PDF document text
    • https://daismene.it/file/71918751086.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gujowawulitijasigegogase.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/bofitokotavolil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sain+meaning+in+tamilPDF 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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 16184 bytes
SHA-256: 252c6c62735cac1312d5cff9624492d21d9f99093cce57c742834cabec47c65b
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 21036 bytes
SHA-256: e4461ca121394624485fabf0ace3cae84e1bdc91154dc0ffc37f2ff9e0c0aa53
font_02_sfnt_off00013e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 10136 bytes
SHA-256: 84c721164ec4ee59e43cc31ac7cad581235ced7147461d6826553083ba0c4802
font_03_sfnt_off000154b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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