Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca31f1c853e788b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 09:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e14bda33c1fbaec5de1cce6f87470ee SHA-1: d9be8c860459fe6c566c3018f70d375a149de04f SHA-256: 5ca31f1c853e788bcd371930c777abceb646363d5633032889d043554833e87f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the exploitation of user trust through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5139

Heuristics 5

  • 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
  • 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://ttfi.org/app/webroot/userfiles/file/sifok.pdf In PDF document text
    • https://martensmgt.com/business_school/uploads/file/bixuxasuvidefoxituketi.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20541359486.pdfIn PDF document text
    • https://777mto.net/contents/files/zawovimizu.pdfIn PDF document text
    • http://393citizen.com/upload/files/24788378486.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/jepubedijetawedolawoviwu.pdfIn PDF document text
    • https://luminex.pl/upload/file/32535392871.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210908012404.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eda57adc05---misera.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/wosuguxive.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/53839677708.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nudijovediwefomol.pdfIn PDF document text
    • http://topstec.com/d/files/73446788256.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd02fb8266b2d22d4a44ecd53ef293b2/botojokukewijegamuwora.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210919122604.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/guduwonoxenutakeboma.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328560a2d0b---wigulotugilame.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kenutigevovedifapabijofez.pdfIn PDF document text
    • https://lecachet.fr/docs/files/10833704187.pdfIn PDF document text
    • https://premium-house.uz/images/file/dalaxojorodinadubepi.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/57027356975.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa794d30d7---89637401854.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/33451148368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+chrome+web+store+on+androidPDF link annotation
    • 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_off0000c752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC752 17272 bytes
SHA-256: c98c9ae42e08f9fe77a4b317182d859708dc1fce99ed68cfc4a934ab906920da
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 10988 bytes
SHA-256: f94d463762220b4deeb4abec203ddbc371b3b7a93a371585be945f6939a5aff8

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