Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27481ec2d096a49…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 05:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51795cb84b140749d536d41d4c5b589d SHA-1: 8fd932dd0428f4fedd3fa832365e6d861f19c3ab SHA-256: c27481ec2d096a49f787b2e4c542583d185b7b8ad0312fa0df79edacf01e492d
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://anaminfo.com/attachfile/file/61508240912.pdf In PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levolum.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/14623866478.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/16857479079.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/68241353279.pdfIn PDF document text
    • http://rivucota.com/upload/files/mojojedepuvazewagodeg.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138254eddec8---30841794928.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bc1j91qsusee0vomm5rosgr1nv/41026906179.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/tupefupo.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/mejufudug.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/86d7d607dbe6e1a4d52a6ccd6ed5d203/jozubuxew.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/88904535866.pdfIn PDF document text
    • https://fratellifurloni.it/file/wasonefizawomal.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/ganivaxobosutejivanipev.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210904051225.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jajinulunedasof.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/durum.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/80379732860.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41659676867.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fenagajefuz.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/32356457220.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/60862335874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=change+notification+sound+of+an+appPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 19292 bytes
SHA-256: a30dd62a518bdaef099482e92edbf195a7bd24713676aced1d342399180e5c10
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 10884 bytes
SHA-256: 2ff5a5e72ccf5a98e90e8b49e302e12df185892873358eed8a457b1c21686f69

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