Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b3450f14f4b4c0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 13:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23ca010bb3dae6ad6af6544c3d5a798a SHA-1: 9001d67c1720b7fdfdccc859ea1d0b263193885d SHA-256: 71b3450f14f4b4c0c9b5a8bcbc0680cc83575046c0d918c4139c0f2712cd0fc5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to solicit sensitive recovery information from the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://queure.ru/uplcv?utm_term=rsa+cryptography+example PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/45b8be6bbe53a9a95e88ef28c57adebc/18050450783.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0mblo7q5j31632nr3nvc0q6ktv/91325891303.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jbg0oggfdonbd9qvf9vag94662/87908647918.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/38819255052.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/40420228882.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e700e0183---39387577277.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdd1f173a6afdd73d321e399edc8d30b/83537695352.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/17a5bc00b82dd2882d27831c42256b86/tibamewigasigozewobolede.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xipemuvubi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb66fb6a16e---31957777293.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/89c63a9dcb8110044b9eb3df171d642b/kasisodudalexase.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kaliziwutelol.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/68b9b460d7bbe5f7db69b0f86324fec5/84808807792.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b86c2a060bc2d6f7ed3b61f9e7dfaf21/5006746184.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d568dec60---56710108339.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/a7omi0kgv927vgpleuu9tosl3t/pufotasidesezajunopa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6c2aab7e---zeladumar.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a244f8f1134---zipupuz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 17404 bytes
SHA-256: 1288f42826fe3464af649e4bdf57fb178d231c59d82b805bc40534b3a5b4838a
font_01_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 10884 bytes
SHA-256: 7b474437127f2921637cb571914cd986f7a7958f313d757e38b85fcda1e2a0cc

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