Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6546362cf9a986c…

MALICIOUS

PDF

91.6 KB Created: 2021-09-18 21:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a294fc44755e435dace3ad4ff188832c SHA-1: 5507eeee76884da15fcc4e6da5b2aaa48552474f SHA-256: b6546362cf9a986caedeaf83452b3be445bc7449a81a5c354c3bf90cf6a4f4ad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • 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
  • 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://crysiq.ru/uplcv?utm_term=3d+parallax+background+apk PDF link annotation
    • http://parmalab.it/userfiles/files/8478187743.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/xezutosaji.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/kodug.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566c62fc18---firawofifumot.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/sesarez.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fisazifalonebidor.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/46880e3ad6596a0d835d7f6023259445/xedelosewowodoxuxinejusat.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/33581431915.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/lolakinovebud.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jutarajovaboxidupamavuf.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/lapulipajux.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/koxasiwisusufup.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_33749EE9ACA6652B.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/tixolejakodedasamabuwiwid.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kedivugurizok.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/44846469065.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0b64ed61---53402040937.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wudemumun.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/41706831293.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/genezojijonofamidetulazu.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/nerojekuvanafediru.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/007b13bf5a831130a7e8503f64dd11c2/62374581058.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/96589165128.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16244 bytes
SHA-256: fb61b487414305a215b905de10b813761f9555aea3418db3893714dec2bcfa70
font_02_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10708 bytes
SHA-256: 06253d4762aa90afc68be63404800b6beaa444c988adc3067db2e90032d64bd0
font_03_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 2128 bytes
SHA-256: 45fd20160753fcb570c50de99009296bf1a3b40a8a190baf136400c151df6cf5
font_04_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 21920 bytes
SHA-256: ef16b74e8b8bdcf87e554f7830c406a526e30f568cc325e0bce20b60ba215c17

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