Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9a95af4c413b69…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 07:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abc0e1254e351386a7aa2e9cc53b989e SHA-1: af94b4ec707a6999afa7d654a9076c6d6f4952cb SHA-256: be9a95af4c413b696cfb3d29a86e3b84ff077bd38f809ccdd5e93c35d904129c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript and link farm suggest an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=zip+android+files PDF link annotation
    • http://phongkhamthienhoa.org/images/files/takefosinijilosegosuxu.pdfIn PDF document text
    • http://jn-zhsc.com/upload/digunipawu.pdfIn PDF document text
    • http://www.520amis.com/upload/files/bezamitijerepate.pdfIn PDF document text
    • https://mytopics.it/uploads/file/70539876777.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad0e6e030---61646476134.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/25687726865.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/82740012752.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/77306881289.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/49415970724.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/wirubejokovini.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109180017597059.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/65107799734.pdfIn PDF document text
    • http://candientuvibra.com/images/file/25089564733.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/93751472992.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/pufoxizotado.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vesilukubenij.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/susixovidopijavojov.pdfIn PDF document text
    • http://aven.su/userfiles/file/60351549301.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/vasomiko.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/besudujufusexorezusunusan.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145286ce14b7---vemiwofoputoro.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/sedapujalukovula.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed92c3b297---levawoviz.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/vefufu.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rasifakumutunovatame.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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 10356 bytes
SHA-256: 1bcbc619b44cd5bae0585cad49a9f5d9ec2586f2707f421d4a5e2c4a6fb3abb4
font_02_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 17624 bytes
SHA-256: b058adc689d0308ce58f2973838d372667bcd8dd63e79e112a5ee44162d79043

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