Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c96f0144ae94148…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 21:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbc807c2168c339ed8ee1ab4ad09c24f SHA-1: 7e49db88190b661d867ed7a07c2c22d3993c0fa1 SHA-256: 9c96f0144ae94148193868401afabb7dc05f32fbd717f785f6757d484bf6e99a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://viettelhaiphong.me/data/dulieu/files/nusinolugo.pdf In PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/2243295624.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/46416376877.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a77988e3d---roribexamuvejanuboxa.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/78365103388.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/52923774729.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210913200604.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/83179160014.pdfIn PDF document text
    • http://okvin.org/userfiles/file/84562324489.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/bolitafesutovokoxusiva.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/32953663118.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4444470292fd497420ee522d103b4ecb/34863340212.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/fijugel.pdfIn PDF document text
    • https://redac.ch/upload/kafuresololowom.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/sorapopagagazib.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bulj3oocdkpnti4knpf442r3/49055721432.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7a8fa44bfea46a0ecb2128d7ba005baf/83913408182.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c85bd858a---12523950807.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/90220708514.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/powosapivipusu.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/87361471498.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/l5qp3f6khmlg7qpd2g1dimnj31/dodaxizodudekore.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/69695202884.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d92a49429fec5fc0adfd72cd03b532bb/paxonazafifazefu.pdfIn PDF document text
    • http://lejonhund.com/upload/riribumezevubofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ai+dungeon+unblockedPDF 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_off0000bc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 15752 bytes
SHA-256: f3071192ee10a8dae17e4ff962429c99e730dca0aeb62f6e9745f4543fbfa244
font_02_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 10332 bytes
SHA-256: c5baae1aefef90db6f09412df1bdf15a2abd3fc5ac550cfb13d85b57e8e025b0

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