Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d56af5f796324f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98cf1c7e8fa3f0bd19d5a192f4e7f143 SHA-1: e6bf0a854252c807ad5a25e839fbc4eaf2e2bbe1 SHA-256: a6d56af5f796324ff7209663e083a44d08a0b55ffdb0870b0152c072a60c255b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links on various domains suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://auxerretv.com/content/public/file/rarizogiwesakojofa.pdf In PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/tarowuvegedikamiwada.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jasibu.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091905311327.pdfIn PDF document text
    • http://huntland.hu/upload/file/437634359.pdfIn PDF document text
    • http://artdental.hu/editor_up/dotubexesuvadenawuvep.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/18077417289.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6726475514.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/14587200764.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/95416772865.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/50846824023.pdfIn PDF document text
    • http://cold.lt/userfiles/file/rijebajoredexisubo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/sigoxapikazebapadolole.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4c6f2676---70374590390.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/waditeru.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/77179561209.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/zikij.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/bojelimut.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cd939d3246937e8470769c0c0704e1d/bomadixarosagasi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ae5358dd---72874646385.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/89913660400.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091902545724.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/95960238668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+listen+to+itunes+podcasts+on+androidPDF 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_off0000be2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2B 10684 bytes
SHA-256: 268baffbc686f309c332568eba2397d488d25c4d0ad65b82e5a60f443d89c743
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16824 bytes
SHA-256: e65b177f5f797017461c7b8256a5e9c68825c54bec0b935c7bdfc6330773cc70
font_02_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1