Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70f1c06e85fc254…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 12:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbb829f67f34e5e9952246a0596023c8 SHA-1: f69932c56ebddc91328435e0c5f21f1efec67263 SHA-256: c70f1c06e85fc254f228ba51390029d74912f1af8e155bd38be0410f0400d4dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=mortal+kombat+game+android+download PDF link annotation
    • http://gemaeldeundobjekte.de/uploads/files/89267537544.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/85177226597.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/41618979863.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/pokukarosirugizafazuda.pdfIn PDF document text
    • http://mosjob.ru/images/file/wapupevokolixive.pdfIn PDF document text
    • https://csn-alliance.com/data/files/55021171766.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/43422221138.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e02d3bf5533efee7ef0abc51d04d6a67/76144504094.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rofuwulazugimejowe.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/figozobe.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/wodazumupo.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/8388242226.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xatalen.pdfIn PDF document text
    • http://davcpundri.com/css/file/1007546866.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/dumuzis.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/fobufavumat.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ad74215d---18732855104.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05ffa0241---75836593116.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e2c6583---putavulozibaxi.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/24247631867.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/22091169328.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/85708545440.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/fixaleziramomewu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/guzivivovowuvako.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_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 17496 bytes
SHA-256: 25052419eaec101d5b3243cd2cd4b2db58c6aa56a54c63c50f7504c73b39dad4
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 10732 bytes
SHA-256: 2428f34f38232fce84809403c81efaa81967b8c8695f8dc5a4a142eecf5d979b
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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