Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e1557bf15242ac…

MALICIOUS

PDF

65.8 KB Created: 2021-09-27 10:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7654d6209e99b9c3e4ff87db98fd5b2e SHA-1: ae21fb2cf661b68761e756ffef05fc48382b76a3 SHA-256: e7e1557bf15242acbe9bb0180f10bdadaf8a93b6e6e4a5fc237ba1288c15e245
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting an attempt to direct users to malicious sites. The presence of multiple unknown reputation URLs further supports this, as they are likely part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4460

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://chukysovin.com/img-svc/files/92364949439.pdf In PDF document text
    • http://hanboo.cn/Uploads/file/2021090717095670554.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/tofabozesexesetoxijemuvum.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/20780360385.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/risuselasepakikavipuk.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/nilugozuzepejuno.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/54910604668.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/futonibaradokekimitax.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/givofarajixewopiwixasos.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/94030418070.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/63874215989.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1632714749.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/88491329095.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1597ae56a432e87a6b0e91befa4f9a38/lipinabum.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210920022311110.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62072bac5d046360bccba28a2fb32e1d/pifuxuxijutugetag.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/85785387299.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/lozopobifukiratadezomuses.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/dezabejuvojaz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514f473186d---bozevonabakegejesovuwal.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/96431390492.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/aad8b18bd9f4245a39d6f14f59d0fda4/puzemavikana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dream+daddy+androidPDF link annotation
    • 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_off0000ae38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE38 10212 bytes
SHA-256: 1885b4f3fc838c754d05d5cf1c0a6c7139e71fb108cbd8b38b00da6f52dc288d
font_01_sfnt_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 14840 bytes
SHA-256: 17f0b89a80682ee92f9946412b4b333e4a8483782bbfab21154cfe5f3abe37c8
font_02_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1