Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c787fa4ab1757…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 02:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c9de41f1c44a6df4f7a7159a73fbe9b SHA-1: 6745c8da90c7f609b318f925fd472f511413362d SHA-256: d16c787fa4ab17571b631d3620e722aa68cc97ee23d333b24509ca5594394d32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to external websites, some of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The 'SE_CLICKFIX' heuristic suggests social engineering tactics to trick users into executing commands, likely to download a secondary payload. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=how+to+add+cyrillic+keyboard+android PDF link annotation
    • https://bursac.net/userfiles/file/20877743016.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7d6db69d---sejoniwazaperena.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/73585634294.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/genofu.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/givoduki.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cec23c5dd---futujudabo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/manutapagozulenefunug.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/vikuxe.pdfIn PDF document text
    • http://inica.org/files/file///73950424631.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/lakuvomanatovifu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/xazodewajotumis.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/gafamuxifatopowadulefodi.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/digeworugawil.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/10325928629.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/3666084141.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/6835871288.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5dd0874f---76542760896.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/tagusogel.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/63581233585.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7890b4a2---35008294682.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/94874585264.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/kozumagukar.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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 18872 bytes
SHA-256: 89b7799962fcc4ff685b25e176c68b7dec60ee5afe15268fdf8c68e14575d900
font_01_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 10616 bytes
SHA-256: 34142d8d49392ef0032d8d68aeab827a716a46b4314693a06fa594be644bb0f8

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