Malicious PDF — malware analysis report

Static analysis result for SHA-256 de192c3a1c25302c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 06:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0bbc1daae0326d2aaca4bb330cf5fd3 SHA-1: 65fcf5674c29c693588a5081eb8c8fb0deea8935 SHA-256: de192c3a1c25302cd323e2f06f9a8cb2b352442708bde3faf84e67c0d4a05852
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting it functions as a link farm to lure users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=arthur+burk+redemptive+gifts+pdf PDF link annotation
    • http://controldellaves.com/app/webroot/arxius/file/11208011438.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/10062745912.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2j224bbtbh6uborpumg9ufvdt5/20647038343.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/6723762822.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nh27d32fbo5n0841diior4fbe2/tivop.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jimuwivokejide.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/4261251702.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/sefonapurevodezerivitijub.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611948c3e54fa---90447693355.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gixoweginosemunaxunitig.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161294311e950e---kekirawirakikalirip.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/12362531057.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/89211709082.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/mejajafipifitatevun.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cefa931085c---45455261803.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/fiweluvisasanaw.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6e6839dd---32130756966.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/90986107560.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/ramidajako.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/selijavir.pdfIn PDF document text
    • https://labelmarket.pl/data/file/26865946965.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d531b871ee---vefeluvevuxizukukekibulap.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22f130f0f---pokif.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/xatubakujumux.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_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 16888 bytes
SHA-256: 9d398bc405510cc65405488157cc2dd21b12e74363a7bca1884cccbe311700e6
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 10892 bytes
SHA-256: fe87c54ffe3bf27ff4aa2d3be71cb6cc6c451780146f11d57bef8e439fd8e899

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