Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aa804c88e63ddf…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 00:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c014b407de763925891dd33b52b26226 SHA-1: 11235cd4abec97ec6c51042f4cc6098c02ee8e8a SHA-256: 36aa804c88e63ddf6b4dde217637e4caaddce184df1d8392accd3b06dff38ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0a741aa6---lugofakefug.pdf In PDF document text
    • https://benqmusicworkshop.com/fupload/file/kijenebekapebosifojabolax.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/90266828023.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/jedolodas.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/mibepetapewafiti.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/nevetoxu.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/musibedefemovefusetodeb.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/fitemurovuxo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760ac7b9fa---7682001459.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/wutuvexel.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/21858185765.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/jelisotorelisimabem.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/15252984652.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090122481373499.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93d92699c---rexolurab.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/jiduxujinapapi.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/83654078018.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/muxumutegusanamebob.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/35427297421.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd48d4269---22156265072.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/xadawenaliburamipuw.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613222cedf76e---safomojon.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zexajipemizoziwuji.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/55578027948.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/573302605.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/gesugizupiwukunelepubi.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/jobozobozewasotibez.pdfIn PDF document text
    • http://topas.lt/userfiles/file/jiwudeboreputaxefivones.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+connect+phone+to+phone+screenPDF 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_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 10248 bytes
SHA-256: a6029267d791190e785d3102484459abf6fb46227d87b02e49e30d67a05c001b
font_02_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 17204 bytes
SHA-256: a00d6aa3bd0008ff9bd4a043fd49fc7820d2ca83500634bca060f0418a401c6b

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