Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e63b2610ffbdf8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 23:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f81b94cecbe0561a0a3b8f3908e181a SHA-1: 888e62d9682a9ed68f2e3dc6ed9be0099a88c474 SHA-256: 06e63b2610ffbdf89d7bbf08f588c76b03d16e26eca801fbfbcb6f71ca18fe87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting an intent to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=ar+verbs+in+spanish+worksheet+practice PDF link annotation
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/9241300bbdee415df0c89bdd4e441d49/4963346650.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ac480a236a45db7e72494b223b2aa93c/kukotapevapubodujovuzowo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882ca6e57e---2007823827.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fimupudotegabetelaxezana.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/65983300503.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/84126241020.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/23014415053.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/jejofeloxexosawebasozuso.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3d4b0b8d295d1acc95f5230803c5dfb1/wasulugi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/77300063971.pdfIn PDF document text
    • http://biosite.ru/images/news/file/samimot.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e515d98c9f6---fesozerido.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/niwunezi.pdfIn PDF document text
    • https://artenika.pl/fck/file/lasafupadu.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/26075927983.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/55092903480.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a834f297a---30554453954.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/14443663197.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133c1ac355---pizuf.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5a3e0911b2bebdc8042423cccda3dc86/63022889662.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 18200 bytes
SHA-256: e196f8f95e41a8a4303bdec8afc9bf06f2e41eb78b12d6b46541f7f502fac55c
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10792 bytes
SHA-256: 72d1ac72e573dc8031ccdd533470ef68c187adfe490266154dee757ceb70e763

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