Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b29babefc7a3fd9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 13:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1793eda787222498fa3f0530db91afeb SHA-1: 1c766172591832c502173c263b7db3707bc2a176 SHA-256: 1b29babefc7a3fd989a3c923092f86fe78096f1cdf85f662b43b8a8925dc74cb
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nawaress.com/webroot/js/ckfinder/userfiles/files/rikumudagufibasasokaje.pdf In PDF document text
    • http://koszyczarek.pl/userfiles/file/62966038183.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769102254f4---vetudogetumitalagu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/vopogasenigute.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/fazime.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a861c75f7aa---puvidu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/lifobojukivatejofopali.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4a70c2034944076c7f0b6f98b36c891d/47952972804.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4k6na6ubj3loo34p5bdhteslav/72612310092.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c2e6117bf874f70c24c6a3691fe1af99/bikipinuzabede.pdfIn PDF document text
    • https://angkalaris.com/contents//files/purozadutubupul.pdfIn PDF document text
    • http://rld-carbon.ru/file/93879085851.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nabuxosewavomelagoxoba.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/bopodegemixet.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f33ae46e23b---lelewex.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090537dceb00---82645306333.pdfIn PDF document text
    • https://digireg.pl/upload/dugitoxurafusud.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/98656574631.pdfIn PDF document text
    • https://alohasafaris.com/files/gesolirexo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2a38962f43006c1061b5c9916d008092/39659716332.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/24646041283.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/1250720707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+business+proposal+pdfPDF 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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 10708 bytes
SHA-256: d441f5348b1eb0084c6a5737213f484f233aa7503ca749d5c26c6b2ef01b9f84
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16760 bytes
SHA-256: 1c183ebceed80ff71e91697482d010627ea4d64d10967dee15c5d2fec4e3e004
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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