Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e73a33b846bbcf3…

MALICIOUS

PDF

59.6 KB Created: 2021-09-26 05:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2188726bc99c406721a20f231637dc31 SHA-1: 54af4160ab6539bbf4b443ff9f044db56c22b385 SHA-256: 3e73a33b846bbcf355922fd42aeb4edcc44394657dc98f386cb575544ceae05e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple URLs, some of which are hosted on compromised WordPress upload directories. This suggests the PDF is intended to lure users to download further malicious content or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

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://dynamicyunnan.com/ckfinder/userfiles/files/47796243313.pdf In PDF document text
    • https://protrialse.eu/files/files/97990956143.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/8101675361.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/32016205948.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fodupafedabokiwe.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/56367275010.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/kisigugenodon.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/62760798905.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/72510546063.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/visebirofefilorezewo.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/setutisalosuwuburesomeso.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/parajutowudepekimimixer.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/blv749n5tgrsk6ja4956in60o7/91292062479.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/6324714862.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/pinafanukasega.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc803700ff---puvakoluzabisoras.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/bikanurefajuzibigu.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/6707159799.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7cf0ab1b879b4f4c60ce98993a2577d4/86988112130.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j4qfi4b3ubhie1enj4dh2upp87/vezasufalerefi.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/dusumolexabokojameporoja.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/54739941036.pdfIn PDF document text
    • https://kokomanis.com/contents/files/96765904185.pdfIn PDF document text
    • http://vina2002.com/uploads/files/birevaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=multi+touch+fix+android+10PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 10644 bytes
SHA-256: 3b87faa1285ee42c1017d60060d16c415694765ec9127c3d08da7de747f44764
font_01_sfnt_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1