Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eea7f5e925c1035…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 09:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e998824d77906c26e8e454d905e46436 SHA-1: c07c7c048b1a053c2248c22b8db7fbb7e41d29b6 SHA-256: 5eea7f5e925c10354f8891e4bfb85807fd0d2cc878001f2ffc70bcc955cb020f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious activity, likely related to social engineering to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1928c5be44---98126543082.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca15366fea---5153881440.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/jononilorem.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3687c482---13669381889.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0d90e8f77fb040334fc05950c2240358/75741740636.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7c953083---lilawonisekese.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/877ebb87c8836411bd48e21e7f0e601d/dukulenuxasip.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nunafezewabapitij.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bb285b85b557c8d7b138e16bd0ff426d/dukatonubuweza.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c40f5b37c---5943798306.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f861495b53---lusebul.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833a1326b2---tomitubafirivigezonovoje.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mavjadoq4grruhd17pluqkq48e/59482171150.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b000c79d23---gumisamixupawutabefudumap.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nukopij.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vajigenebidojobovenaja.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8c1db3680976cf1a7fe7e439df531e82/vunigabiwo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/93bgps8rpsl8dg1b9ng0i7rhh0/petunefaxulowowariwi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608818e1d6981---43133022027.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af234b6f9---pimowukiribelol.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xisubunimiwuv.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vavodu.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/96630800357.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/44qekmkftr44mde4ruqam0fi0a/66837505184.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/32139398335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=reading+comprehension+advanced+level+with+answersPDF 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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 11160 bytes
SHA-256: 19337e5ff97ca456c08b658be55f804448b8d7d976cace470f10d12951ce8475
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16340 bytes
SHA-256: 09ec2a94548a1b6382413f640c0055fddba878ca76a70e46f792716650e18eb0

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