Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25916b187faf4b1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 10:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27d753bc5fc62428e2ba0c5291738da7 SHA-1: 13c1f1245c7f239df3d05eee977aa41b0855d85c SHA-256: d25916b187faf4b19b4357fec9124ee1b48c6d3e208a9d6afb1003071a912d73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure strongly suggests a link farm designed to distribute phishing lures or potentially malware. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://abogarestudio.com/userfiles/file/93515852424.pdf In PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/nugatelifox.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046090d977---buwiwuwegojotukuwaw.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f76dfafd8c1c5589dec672d5267d7f04/47515194450.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/16832354254.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/6680494940.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f353af4c8cc22fe9f9fbeb5f7819fd05/33402849503.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4e4d6874---26883643253.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/48186211478.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/konobikolufofotaripesog.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/16838345932.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f3t9p3fpvq75i5kpcf4jldgoog/malaxemojem.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094910407e3---telopinabebo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f5431cd7---74889962639.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fn732tdjt6mthlcc48qtt7bo92/72172609581.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/ledibenu.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/romaxewevesupakefe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb03cd378c---61899148605.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/50423535713.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/409bbce5e66778b20e794f1404908f3e/18251606141.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc46e75172---wazuzalunaka.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/xosureto.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/89623863054.pdfIn PDF document text
    • http://dd-eng.com/files/files/podiralapisebipofa.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/97235289074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+forebearPDF 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_off0000d044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 20028 bytes
SHA-256: 1143cc5e9a3726bf2f711301534386094e2f2e94bdc70722608028b1999b9c67
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10212 bytes
SHA-256: 4d89ab28ee048aee379430f953ad7a4f2bc0e43113df094e3b24d94ebe290685

Open this report in the interactive analyzer, or submit your own file for analysis.