Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d5208211a361ea…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 11:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2bbdccd07d7a16706a188a529b69525 SHA-1: 467e2f8c82fcb341beeb2c9c4468c45f321469dc SHA-256: 99d5208211a361ea410be9b608d5d8e5e5942cb55e62633019c06b41a99b7395
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting, as identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests an attempt to direct users to potentially harmful content. The embedded URLs, while some are marked benign, contribute to the overall pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://ndt-ultratech.com/files/jetulofeg.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/zelugogefijinitegud.pdfIn PDF document text
    • https://fultoys.com/userfiles/92446329437.pdfIn PDF document text
    • http://gewald.ru/content/Files/fotopowa.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/96706421494.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/rizibitulepij.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/66314063314.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/25993267791.pdfIn PDF document text
    • http://clingac.com/d/files/bisewalarafibu.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/pelokipawodufa.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109090403571442.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568564aa37---tajijazurakazisejoguj.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/xirepomadugofesepazawur.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109132135267659.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131afed2e3d2---sitosofiminikamidiwusetab.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/mogorejizixagirusikovo.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/4790011008.pdfIn PDF document text
    • http://rs-entp.com/upload/file/lirup.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/7263392672.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pelofedimitexafufoli.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kitivufirezotexasen.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/32756227452.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/pewum.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6c08f827a3d2d81fc6dddd32125e7761/kebuvefojopepajemopet.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/68273986978.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/52995342607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+san+andreas+online+android+downloadPDF 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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 10368 bytes
SHA-256: 010acca6a812f1adf299df49c09d0f1b67f55399b697cc3f617534d496f6dc22
font_02_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 14196 bytes
SHA-256: 1e12fa8573e1603cae3fd7069ceabd548923d62deb884d4f6f7bece36e4c171a

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