Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc56708a41b0b969…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 01:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf6ee8be160d8031509d09879144c0f5 SHA-1: 7db4e8a2d5b6871528d8734c62f990e3017f021e SHA-256: dc56708a41b0b9698c9d2adb59505e9c67c65ba99b6cd48ce9c5b3f127b187c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to a secondary malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://datajournonepal.org/files/gamikiwepeduwemodap.pdf In PDF document text
    • http://yongqingtech.com/d/files/45388926707.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/78212404016.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/25097740347.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/kuzibesuwakotu.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/4720617928.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2f6b6859---19693984533.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/58430275794.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/25549206625.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/78200458695.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/xedij.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dajixugufade.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/14766563756.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be90031b24---nofugapetilifamowosa.pdfIn PDF document text
    • https://bem-sa.com/img/file/romukerazi.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109020726456241.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/vadojo.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/sulakajoxelubokepunovewu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kolivaroxus.pdfIn PDF document text
    • https://termoformat.md/img/files/68702161771.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/be4836c473f8855a6a94a9462be309a5/zikudekamimonowukimi.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/91063853022.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/wokovufavijowebowip.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/17871584720.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/43161104112.pdfIn PDF document text
    • http://hmed.vn/upload/files/gojijuxovojubajeg.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/sokifepelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=us+sniper+assassin+shoot+mod+apkPDF 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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 10712 bytes
SHA-256: 44e00947d1b304702709c030ecbea7c08a42a89c62675a0184e066f33d1b0519
font_01_sfnt_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 15432 bytes
SHA-256: e5916db28aa59601b9ae7c31717851c698609a0ffe8657c2a64ad2209e4479b6
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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