Malicious PDF — malware analysis report

Static analysis result for SHA-256 960d811c89bb564f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 20:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8cbe95fedbf884ab9d98fdfae4f56c0 SHA-1: 5654d1175db77f5730692fe5aa897a6c8a255f81 SHA-256: 960d811c89bb564f6893e37e13cffcc06fac0d373b26a6fae561d3581776472f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kufeleburaladiwabulero.pdf
    • http://unsersohn.com/images/file/bimebakasasixejojajeju.pdf
    • http://driver-jazda.pl/upload/file/zuduvifawamosulaxobin.pdf
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdf
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/35385126896.pdf
    • https://glozorcom.merlak.ru/userfiles/file/31822993687.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed70142c9e---29955500912.pdf
    • https://tylbm.com/Upload/ckeditor/files/64895657814.pdf
    • http://handsonmontessoripk.com/userfiles/files/sefujomadavuv.pdf
    • http://myphamnanyno.com/luutru/files/fesufadaz.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/xoxebokotu.pdf
    • http://sun-apartments.pl/data/pages/lifovewoditab.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/75578024a3ddb3d9d7b436f9878c15cf/14684070599.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/winaju.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/61241709391.pdf
    • http://zentrumok.com/userfile/files/10669345243.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/53769456163.pdf
    • http://jedwines.com/cmsCart/upload/file/76991912678.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/96917903980.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gododapexafomun.pdf
    • https://fcimoveis.com/imgs/file/tatigekimapin.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/59149473540.pdf
    • http://kor-ra.ru/UserFiles/file/11736750478.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaddbda795---84753187007.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837d29ec46---remazodunetegit.pdf
    • http://simpelms.nl/userfiles/files/92885502454.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+pedometer+app+for+android+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b609.bin
3391fb752a3976d08fa26f7fc7ac745f59acb1cfe7f3020d3a22eaef352d1e76
pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 11128 bytes
font_01_sfnt_off0000d017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 16792 bytes
font_02_sfnt_off0000e829.bin
68c391f85e860b3d473b840ae4da1c977db4f614968038fd18576aedb1236365
pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 15128 bytes