Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11c44fd8c425360…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 03:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 439a6d44755017ca48b98e37d3d8801b SHA-1: 635c12a8537df3b7c9b7623d46cfc5508d5eae43 SHA-256: e11c44fd8c4253608862536aafbe9ff3cf7aa10e71afa04d3f5f2f7221078c01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are associated with compromised WordPress uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised upload storage. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDFs. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tydafa.com/dafa/uploadfiles/20210920000948.pdf In PDF document text
    • http://aqs-group.it/userfiles/files/83220341561.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/44559999113.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/nojajemagiluzukarugezat.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/26462373935.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6c30d77b5---vuxaluvapowezolubutetorow.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/givosezojazowi.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/282228326632.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/romudupurijese.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/miwabezilagafudaxagi.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/95949961872.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/jiwelofuru.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/lodoxog.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df09a159db---7637892256.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/48534748190.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/19864244159.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/684a535d5f1752c3ab0b4c5e8d3e5bb9/19559544535.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/93818902435.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7681455209.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/704692325.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bomaxavatexomogum.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/goverolobeba.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/geririsojuz.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/pepiwikidefigalipofanajif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chrome+os+android+supportPDF 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_off0000b744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 17868 bytes
SHA-256: eb5e1c44f362557552e8bf027dec950319d808604cca388d62ef10979728ee33
font_02_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 10744 bytes
SHA-256: 3a96aee9d0a9c7feb0263700915692c6eda58b7ff66367804bb1869f75f06770

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