Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b29769bbccba46…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 11:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7843f00c5812c90cb4e3e0b78cdb03a1 SHA-1: 950b05e07ea4189511607254d9a8969920a476eb SHA-256: 42b29769bbccba466b75d7f2bbb99e6e591aaf3583cb4303190d166fb55a3755
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://lacaune.hu/userfiles/file/82710870612.pdf In PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jerizajipowomexuxototen.pdfIn PDF document text
    • http://afslab.asia/upload/files/tofutixigafipexo.pdfIn PDF document text
    • http://speckrepej.com/upload/file/74062377672.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15069833797.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/kotubetusozasazize.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bch9d8hs0md6dap17v00v38f55/buzamiweti.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/vasivepufulaxikuwokikew.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/22403865685.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/zutogexisipa.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/zalewese.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26325633529.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/xixewezexobarejekukakut.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210901061133.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/jumokugareli.pdfIn PDF document text
    • https://argumentua.com/i/file/gubumu.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/80971991080.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/mefufutinaragipizopoput.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/13016612029.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/33950807623.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd792787d0---mulinawoselam.pdfIn PDF document text
    • https://polytex.de/sites/default/files/16095912340.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/64939796964.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/wusegukonedojoxuvil.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/jumegojutevenigasokodav.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/51701808958.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec1fea13d15788c7e874ca934c0b75e0/38714116178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=s21+live+wallpaper+downloadPDF 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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 17116 bytes
SHA-256: d5ca249a49502fda042230d203d0a38aaeb7272600f84ffe7ab54b03be37efc7
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 10520 bytes
SHA-256: 3419dbc7c099829e2adcfab6cdf94d822d0bdc14104795a5a9cc6ad94153fab6

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