Malicious PDF — malware analysis report

Static analysis result for SHA-256 081aa75209e28cc9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95fe7fa3913ecff5ba7327e90599f6d9 SHA-1: e4af743e26ef83dcf62d9a42e2d7f6a83269fd79 SHA-256: 081aa75209e28cc9658da7467cdc509802440cdba0f70abeee6bed2ebf2a597e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The document body is heavily obfuscated, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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
  • 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://qishuochem.com/siicea/userfiles/file/vapawutunoxaba.pdf In PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/28468045714.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/6923968036.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09140b089---65384233547.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/wamuxefoj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ob8akhr5rum0blnq41turuoiq7/11456887550.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sirumipunefedavero.pdfIn PDF document text
    • https://parc-hotel.info/file/91867311620.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908232612824375.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///44350827751.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/74891705758.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/wikatufezaxa.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/pulidasufog.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/zajadokosora.pdfIn PDF document text
    • http://orderkai.com/uploads/files/88923694115.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/69280951235.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/gubujegagowuzejovo.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/2894059121.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143b93b76fe1---jovogulovasexila.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/68372030536.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/wemopiwavazat.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/repulolekigoputubikiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=youtube+app+new+versionPDF 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 18308 bytes
SHA-256: 7c151f04c9f5d5e8dfef5b029aae1cdd63307f330cb0f0eb631018ff24914c58
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10576 bytes
SHA-256: 44867d384ae05985c175129a2f749a9a600251416794adafd6b51ced9ac1e9a8

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