Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f54ac3a10365de…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 19:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47380cd76e12fadbfa719639b0fbd058 SHA-1: 917020b3ac2925c98f5b551a75dab9c95f1ef5f6 SHA-256: 51f54ac3a10365de0f07d047e40c87f9695978e57857075cf58edb3d82c82d7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links, several of which point to compromised WordPress upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://divetechmarine.com/contents/files/66046020021.pdf In PDF document text
    • http://bonezi.morefriendship.com/upload/files/foxibezanapowurexizani.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109070606471146.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40559254120.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pabonabowodepe.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/56700646054.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kemedifuwojejobanev.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/82231969567.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/25467506614.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/8521849787.pdfIn PDF document text
    • https://maviet.vn/upload/files/17824393495.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/lizopobituzafuduxo.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/95328566943.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/60088234095.pdfIn PDF document text
    • https://citronel.com/userfiles/files/witis.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/453109515.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/wudejokuvamawo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/86393718895.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/17333582841.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/bumifor.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239c7d52bf---juviresokiten.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/21041063120.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136bebc139d9---bekimoguwubedebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=unir+3+pdf+en+uno+soloPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d1e4ed11---25436347945.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_off0000bcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 10508 bytes
SHA-256: 2e6d3e98371e5d6a1d8c0787e002b214f607b2388c28d1f6114eab38eeca7a25
font_01_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 17972 bytes
SHA-256: f3db798b0d0dfe175935a418c9cc10158e0613f5f5c2d545f37fd43a2ce7f770
font_02_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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