Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c396b48a95fcc7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 10:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e470c8d203871ced88c10cf4522e94e6 SHA-1: b743755ab5dc2cbbecf36dda77c55f24d9506969 SHA-256: 09c396b48a95fcc7205a33bc286a5c34c9160017edcc6967d82d4437586ef55d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. This suggests an attempt to redirect users to malicious or phishing content, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160984d7ce004c---95448120912.pdf In PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/137881c28d05bf9ccf612b30a740e18f/54490311066.pdfIn PDF document text
    • http://kaies.net/upfiles/210816075951407153vpzbzu.pdfIn PDF document text
    • http://asfalon.com/__files/file/35032221450.pdfIn PDF document text
    • http://zaiger.ru/img/file/17159766463.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/28d32c263e7622a31e2af5901f093987/37754618199.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/46242326153.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/60294110546.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/gonedonobebeludude.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/27340725987.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/47108544057.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081137a89783---4279594544.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/litek.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097d66270d04---68644150585.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67697736412.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160858f17a40a6---sobodenafijelilumik.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/75128500067.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/loginamonorobixukaj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85d9047d8---jevodidefov.pdfIn PDF document text
    • https://estoniapools.com/contents//files/perovimunevopifoz.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/77857265038.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d837a65796e7d4a17e0f631b6510a84f/5384034587.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1434d75bcb866f90cfb340de30214f1b/90768132297.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f53e2814---jurerovetunikudemilagel.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/78161615699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=advantages+and+disadvantages+of+capitalist+economyPDF 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_off0000b853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB853 11024 bytes
SHA-256: 2125a7cdb3b65bbf38cf7f373b60baa5871336c05073ba4df44c95c98cb079c5
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 14792 bytes
SHA-256: 57129d24e52bfaca40f8a433777b1a2278a9c589a175b3dfa5ba21e4c04393a1
font_02_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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