Malicious PDF — malware analysis report

Static analysis result for SHA-256 a096494b2a36b0ce…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 08:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d1e1805c072c430d2adfef44e45b962 SHA-1: e67853b0358e4697c5a93db35d5e66423116a920 SHA-256: a096494b2a36b0ce993e84d3ca18533b7188936454340c81b4d27a4973110f71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. The presence of external URIs and the nature of the hosting suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c279ad34---gorogujadeb.pdf In PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160823b5c6166a---47887871148.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fad152310fa1010bdb6b7af4c01f7b21/93160869583.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bf623a7f6---72723937122.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/201320481961135d94856c8.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899156e7352---rewodebezamakotu.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa97a48e5---27563699142.pdfIn PDF document text
    • https://vzglavniki.net/data/file/womesilamadugazezejo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611cccd2d3a84---lakusu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff5f7ac97ddaa7cc94fbc6687e779ec0/vegamolabufi.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/77514551379.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sirigugabagavog.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/34348238260.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/96098240342.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/mulesa.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bofenojixag.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/15526746324.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/65331262705.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/80096cc891e83333a95e8ca5df1d97ee/vuzozapezujamukumeba.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/bedajirozikulavixireku.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ad12bad28c1e90b3e87959b04cb84721/zudenogubezakipuve.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/35427492043.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/nukonubilupumugapa.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/wesaroxuwuponez.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/jabusoxopewamosinejexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+refreeze+meat+that+has+been+thawed+in+the+fridgePDF 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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 11284 bytes
SHA-256: 3c685a0fe2caf3b47eab558d6918d6ba5359c73d90c3412ed2fd1dac5461ea5d
font_01_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 17224 bytes
SHA-256: f8e6b724e1eccabb33dfd5155791b6ff1fc8db2837afb2a9a17cad99939e58b0
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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