Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2d899bba22c6b3…

MALICIOUS

PDF

54.6 KB Created: 2021-09-24 02:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5aeeebb3fc42f104f77ab2dca52c3895 SHA-1: c631fdfcab786bd246d4d1d6ef0d316db7c8e2e6 SHA-256: 2d2d899bba22c6b3ec8ff12de1720123e62f0bbfe7b594e5bd6c76742e9e53be
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or malware delivery. The sample's structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6885

Heuristics 6

  • 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
  • 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://cructi.ru/uplcv?utm_term=k+object+words PDF link annotation
    • http://medicapoland.pl/uploaded/file/zutoribuxelakuza.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/12858062394.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/57572571218.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nudoxafufis.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80078195098.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109140320237325.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/fafasezew.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/14501932628.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_52E71DAFCAC16222.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/23435631055.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kegefewaboj.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/suvorofa.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/femunu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kabasokadopozuteba.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/bitewalemefisivodofisud.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/84363463503.pdfIn PDF document text
    • https://j26clean.com/upload/files/gimexugisaf.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/misobawir.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dc56ce6d00d31c202c5aa8f9c375a947/fixeratixuxonozoke.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6db40d353028a044f27ef8076433fd49/raresegefopedixokot.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/dirarovugijuzejurur.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c5v03e102dcvqo13rbl5r327j0/66456893155.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/kawut.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/zumugupovuvekotapimogori.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/putuseguponumituvaked.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/wujimekadapisitamab.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 10304 bytes
SHA-256: 25a8e8f93a4259ade7c1dabf3db341271df05f2e70569c56064fabec9d2d552d

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