Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5004f0c0d832a18…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3110d296f95649b3862ad6cce0a41e8 SHA-1: 423df28931d8898850487b79cae40e59e78edef4 SHA-256: c5004f0c0d832a1809245d4be2e377cdf2549cf4370715f75b14d77443384323
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a social-engineering lure. It presents a browser extension or update installation prompt, a common tactic for credential theft or malware delivery. The document also contains numerous links to potentially compromised or disposable hosting sites, suggesting it may be part of a larger phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=what+is+the+default+browser+on+android PDF link annotation
    • http://amicissiapiemonteisa.it/userfiles/files/moketasusenikubewekiti.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///pifikipobulemiti.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad29b86a1c---tuponudorafepeg.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/zomedajobokuxuwonopeda.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/847a9124e7414cea7b69c00e2c05d6be/15341160635.pdfIn PDF document text
    • https://verner.lt/images/files/gufujux.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/2022139926.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47505471757.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///jipawujibarozured.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/viruxifenepidedixifoxut.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/46948700838.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0312cbdc---duromu.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/lomudekebexuxisub.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nubavujojagevasozemebiz.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/83687839005.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dt073o5778f0kto8b9cj8l563u/josodugebamilotuzipoliw.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/47189056563.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/82351785336.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/vegosuzegoronojubuzut.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/86468017949.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d0dc2af---66715556973.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/9897844099.pdfIn PDF document text
    • http://446888.top/userfiles/file/rozofin.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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 18012 bytes
SHA-256: 6c6cd9663d33438dca61888688e8ff18bdb3a4222a12e6cac4b39770cd6d4adb
font_01_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 10772 bytes
SHA-256: e78c4a852011b9b8b80b8107005414430d8d9a5aa086661c1f74a31f1b165c4b
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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