Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dff786667a638d8…

MALICIOUS

PDF

98.7 KB Created: 2021-08-13 23:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccc58fe400fedff1c358d246ab144cc2 SHA-1: 6cbb464af92fbb16e1a4b228c9fcaf53b846710d SHA-256: 1dff786667a638d8dedaafcffc79073a8810d0e9bf5da7f5e4bb947b9921649e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded URLs and the PDF structure suggest it is designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/uplcv?utm_term=ejercicios+de+operaciones+combinadas+para+ni%C3%B1os+de+6to+grado PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14f50c077---wawubaxa.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/90996951891.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5281f186077a6435161262fae321db4d/9519588293.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/nizovuxurerimido.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c201ce0c6b6---9804986940.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abca05364d---tubalilakewuniterogima.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/732d81c8d6401f3c8f73057fcdd15bd4/numaruwubukigizupab.pdfIn PDF document text
    • https://ysh.my/userfiles/file/verewizuvuxeragenu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e705b77b3---97463837227.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee524624a6---6433517991.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/nitomelugivuketavafedi.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/64877642588.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/sowosilovuramoto.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/miboxefojakopozexokok.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cf84f0a200243e751c32dd3022e320c5/xotojun.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zixawevunezawika.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/bepewelazironigaper.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d2158c91---76694620698.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/030710ecbc240bf40e72ec8103513b79/tonudaxulevifemoxuk.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/sugugalab.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/totoguwuzotoke.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/18590953530.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_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 18852 bytes
SHA-256: c7595263aae31bfda384a9cf35938705df5b0510f3edc785a079885230aa572e
font_01_sfnt_off00014714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2B 11440 bytes
SHA-256: c486a6e20aad4ce92b8cb10b849ff85fcae3a330413870bc39aff6af8bf1813e

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