Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f23bef2f764255f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 04:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f90fa379e7f545812a70103fcc5393ab SHA-1: e4f4e366557145f5a02db7c3c5209fe2de1ddf1a SHA-256: 9f23bef2f764255f1230621902cc5ea314456d6342eee409ce550ef6c7935072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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://marienoellebermond.com/img/uploaded/file/suxivufexawetuwewasu.pdf In PDF document text
    • http://vigen12.com/userfiles/file/vagajatamoxofobijuj.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021091615164273499.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614add77395a3---vatojodimufofimubajo.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/35709147609.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588757e4a0---95885871796.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jetajisugapiduwudavus.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918153846513531.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/faxirutezotirizozewib.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/59050378445.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631122253.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/gejezoxiborugubawigur.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/kigurovupa.pdfIn PDF document text
    • http://www.ezmoving.com/file/rurugipenofaw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadd947f25---wozijotize.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/14203718996.pdfIn PDF document text
    • http://tochuchoinghi.org/files/tunebamaz.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/73995284584.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pixodazi.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/27429063619.pdfIn PDF document text
    • https://eternalbliss.net/file/59325525779.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xamezakunugotanewame.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xuwufedomitorupivupu.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/kudiwekikeligupupovaw.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6b539569---bizusogiwaxawuderuratowu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jimatojizer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gervonta+davis+vs+mario+barrios+updatePDF 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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 10852 bytes
SHA-256: a8084f7ffce97f515fc8dda732ad97edc3d9c89c369c5c5efbb36a9203742640
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 19296 bytes
SHA-256: a93aed26d82b97946dcd63cc2a13f6c25b22f62742283e95a8ae873b90da82ea

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