Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a21b08744886d1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 05:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6b74ef815e4a15f47b149fd24f7be68 SHA-1: 7c0bb5fe25460f829a24d7a7b44bb394db52f967 SHA-256: 39a21b08744886d11ed2ea84df451dd6ba4a53751882dcc6db874f140118082d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this pattern. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

Heuristics 5

  • 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
  • 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://alexandrapanayotou.com/web/images/static/file/sawowira.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/7240100996.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610271629f51c---zosiferus.pdfIn PDF document text
    • https://mattress-leader.com/media/83275901372.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/61650907134.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6rceurtbcopi29de2imm7p4i1k/kipetopizesetavitebogifu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/624324572a16ea0211dcf597937af63b/vutawobofat.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/xewamox.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f967f0ef51d---luzutiwefewejose.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/jokunizapako.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b326008355f---zuzalofukibefibupatig.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zadebifojo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a75e6a3818e625371de401e7df000ac3/suzixixewubumugewana.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v740lt1b9eb2ndehkklh8dd0ce/kujis.pdfIn PDF document text
    • http://weingut-suppan.at/files/77958692890.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81b75a1e5---fowap.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/tuposanaguli.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/20lr57s06ammqlcustrleppnt7/tusowobu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ratufovajavipijuto.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/xuvabowuxaxosuli.pdfIn PDF document text
    • https://dineflon.com//files/8154218677.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/joxotojagefenefuvavaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=design+of+steel+structures+code+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 16096 bytes
SHA-256: 854706fe2edf87109e715fc28ed28e315b5f6bdab64685532558c0474dee3c38
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10964 bytes
SHA-256: 9d23e5e5ae7373b7c14f217d23d1a5717cb794ed888ad21e0c289e168200231a

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