Malicious PDF — malware analysis report

Static analysis result for SHA-256 115ddf133f297f62…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 22:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31ff1dd4b8c17bf693413dd10448fad1 SHA-1: 07d1e987f246daaf56a7ca53d50e71fdfb53b2cc SHA-256: 115ddf133f297f62630bcc687d7a475de5027454e2bea3346b6310331b714823
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common social engineering tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=how+to+get+into+a+phone+with+a+pattern PDF link annotation
    • http://oldadmin.k12cart.com/media/files/91480540100.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/wekiril.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc4cafcc0---jefaluduvafenukof.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/meximerelefopo.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/tosenusoxudigizi.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/52402375583.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210910205444.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/mirobamudoxunule.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/112305312021.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/77674836202.pdfIn PDF document text
    • http://strahyi.ru/images/file/mejotudasinibobot.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/pubeledanazagomodofe.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/60359035110.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rawaxejowezinagemorowi.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/75851830101.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/13492650731.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/51048244454.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071053051966.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/37979102153.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/67309481403.pdfIn PDF document text
    • http://alptw.com/images/files/subebemireronog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131816cb9eeb---64110259996.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141193a14972---33899280047.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/zunevuvizobexuliriwad.pdfIn PDF document text
    • https://keongracun.org/contents/files/sapezikaz.pdfIn PDF document text
    • 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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16416 bytes
SHA-256: 1362af11ae4a848e4c57431d850d33a0c7b23920f964e4af9e205a9ca826c2d9
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 10396 bytes
SHA-256: d8b11dceed009a066b5c9d304c4adc050bf0656a3efec1ea494a937b5b3c8f2a

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