Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67863f971f489d0…

MALICIOUS

PDF

95.4 KB Created: 2021-08-09 11:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e67d9d30f4e1df8cd678a3c4ea8b296 SHA-1: bdbcc7905b91b7f48c2c5dac8b742d1beed8cbad SHA-256: c67863f971f489d0306132ef62bfbb6c19c18eb81d0362c9c7fa72e14fa4a8b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. This suggests a distribution mechanism for phishing or malware, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c796e698a7d---tuzukupagarow.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd9cce59---99222328758.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/fajudaxizukek.pdfIn PDF document text
    • http://chromavials.com/d/files/33915935512.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b22ead193c2d92e05338156645b797b7/90036202787.pdfIn PDF document text
    • https://fallsplat.se/file/15884374540.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e8744db9cc58f3a4f16481ab33692d02/jorasawugajizakejosorazi.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/95646820346.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f6ec335f8---jiwalazutov.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71cb04d07---fipobodexi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082101bca2f9---sidozesad.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c5672957---64267787221.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/xokudowujozasejabopuwoxe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071c81ab7629---57989920727.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ad51f738---18138149189.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2793b96caf---25894526159.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a211a6da---46020601333.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/180b7ef1377baca076f91fe21b9adf60/72067932581.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/falegiziludujimev.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef9f5cf97---doderewafufevojupas.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/lewujimevodejaferawaja.pdfIn PDF document text
    • https://flyags.com/editorResources/file///pejafidijaravaxon.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/fedusazot.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/dafovuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lincomicina+con+dexametasona+inyectablePDF 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_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 10744 bytes
SHA-256: 4c68e330f71273917addd1d67aa05c316a1dd4aa83b95a1ffb2ffff520a3dafa
font_01_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 17820 bytes
SHA-256: 8454f790c85642815e036fbb78e9160a7a00049c01bfaf94144ac5d75cda940a
font_02_sfnt_off000155c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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