Malicious PDF — malware analysis report

Static analysis result for SHA-256 372810f7ca88e203…

MALICIOUS

PDF

70.7 KB Created: 2021-10-07 01:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d85ae26ab71676f2574d071eaa63dc35 SHA-1: 72ef7c31bd0aaa050cde3fd8992fb16ba302d709 SHA-256: 372810f7ca88e2033d40626157df912bbe2e6e8fe237f6dbbb6760705ec94aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/beff6da774c08d152c082bb5a466270e/juwumorokakoluxujamezina.pdf In PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/46129033372.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/48103103570.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c059aaa2ce---82152399726.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fekakomi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448719308af---bisunolukanekimigute.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109190117055103.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52c083b70---45566051700.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/xesomumeguzewujowuneze.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/naxakugexusijopipevagi.pdfIn PDF document text
    • http://a899.net/userfiles/file/39495144404.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ffm6sgiqurpbadq49613jha0n8/nakagebaminapanok.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/67833147733.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/87444141364.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/97872506759.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/komosuvatimosarefesib.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/53995017852.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/golobu.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/moxunawitetisowizubeba.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kobekojorokixugenob.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/20219202351218083.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145910c07abf---gijupurogo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/siwutaxerizorilitik.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tozavas.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nazadapajabagazujerisivo.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/wewixurofowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=norton+theorem+solved+problemsPDF 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_off0000b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F6 10588 bytes
SHA-256: 7b55c1e065e26943d0a2fe6b26982196b4e1106692ab7c863c779a6ad5080122
font_01_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 15596 bytes
SHA-256: c437c473661ffbfd855185c37f1d9c39874b26ab11b61e048cb4eaad6d074abe
font_02_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1