Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9240ea1f963622…

MALICIOUS

PDF

105.1 KB Created: 2021-09-22 17:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a7e5ef5452f424d323f2563f7d8388d SHA-1: 40c8514ca990091d91c1209a3fd465a5f2501fe1 SHA-256: ce9240ea1f963622e7b001557a442664c67cc3c1833c72d3dbb152d81faa7d8e
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 on disposable hosting, with multiple URLs pointing to compromised CMS uploads and potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://luxm.pl/userfiles/file/7113684849.pdf In PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/70537144288.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/80680441450.pdfIn PDF document text
    • https://ijp2.com/contents/files/wozunalusenalavotewabe.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7308dc1d---69038779847.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dbf20b11c8ab9b08f168ca5dcc76e018/bijibapelaxenawatafuwe.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/tebesikarevig.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/21593399846.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/varaxugewumek.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/vezimudeniwuxinu.pdfIn PDF document text
    • http://precisao.org/files/files/relixinedagewiz.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/10250720026.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2414325---28220994416.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/vokiraxopajogigiru.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pokumavupudodexetu.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/volun.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/mewipeniwomilotuselejas.pdfIn PDF document text
    • https://istanajp.com/contents/files/bivelikobototu.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sonewutufum.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wifukojukiju.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/58933396839.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/zamubukunaluleta.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a5c09d27a843d77619dd4305361f310b/vukapuvisolubizadepu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dogerizaxuxokejobo.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/rinunepuzanotojoba.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/39295013622.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/josibuvek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sky+combat+warplanesPDF 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_off0001334e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 19008 bytes
SHA-256: 5cd9724f1fbc18a742b39d3859f6fb18415e9836011acb92cd771c763e358dca
font_01_sfnt_off0001653f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653F 10952 bytes
SHA-256: 0a544a6562ae93dee8f7c0ae7cbb56fa6f5484ec96c6cc7bb50a56476df1156d
font_02_sfnt_off00017e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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