Malicious PDF — malware analysis report

Static analysis result for SHA-256 26241225804f45b3…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 13:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed8f1619c20f9c15752ccb472c9160be SHA-1: 9789e0d99750e453b42b3f55ee24d0489e4224dd SHA-256: 26241225804f45b34750ae4922f304969d9e3895fe4f35d61240e72bc94a7ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ta26puu8saaitr8nf4ujbpe2hp/48341016662.pdf In PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/reginu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bb8c595960b48d07ff4cc96d8a6f6f80/tojaziginebijugipepuze.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/55614920057.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f74e8f7aebe---jopiwikakunajobogufemata.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d033718ebb0---dowelokuvesiro.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfba77671e0---90176107239.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c977f241---22538416659.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1475ae3c2d57df545d8f272dfd2d9e57/51412880690.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/zanijutikegowariporobufoz.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaae5d9069---484877043.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2bbe9e319a293303206bb8684b9131fd/84937110753.pdfIn PDF document text
    • http://czminghe.com/upload/files/39242696588.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/vujojowunumulexodubagomof.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4a76bdde083e6afe6764bee8699cc0a0/mekuvugotobupeka.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4c497eaa---85091712952.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/5288317666.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/lifisujugipafi.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/4e9b41925ace09838f0fb2e8aa703450/fizavitadi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1981dfbff95891080dba16923e2727cc/sezotunal.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/o2hm1adpdk4642qccuaavh41l6/12921164204.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77af75db9e---84573740161.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/166756114401624926237.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/gakuxan.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/wedenufebuzabitopimar.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210709232039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=elementary+linear+algebra+with+applications+9th+edition+solutions+manual+pdfPDF 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_off0000c477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 17720 bytes
SHA-256: d59d70dc8ad3743fbdc7d0d45a51cb5b07643f218e31d890987306d5459d6d0d
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 11660 bytes
SHA-256: 57204b82eb5af3f89a57dfe68d50a14a7b0c2336ea3ce7e208e71403da8805e8