Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff5d50074561a8e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 08:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a6f648dd877ddcbba90fd0c203242e22 SHA-1: c8887ff8dc04a659a6d5cc847eea607098739859 SHA-256: 4ff5d50074561a8e094f643b7fa9a3f2a7ea6eb09df3253a825e8a00ae6d7112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=python+coding+pdf+download PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6ea549b554373082e2058e84290bd1ea/81964997365.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2968288005---51795574275.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fecc71567d2f0e510f0fbe855342e637/24529344200.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/30765728194.pdfIn PDF document text
    • https://gangnampools.com/contents//files/28813918371.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/49634921350.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4mqbc6pjotncijnla9l2sifta6/pakugidixagujajabodu.pdfIn PDF document text
    • http://scsytech.com/upload/files/widotamotulegus.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e813e835892---6277967057.pdfIn PDF document text
    • https://satyawatioverseas.com/userfiles/file/97730656261.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/81462373929.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/55712499986.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f228bf8a341a6e201a0b6bc1c8d7285d/12084074580.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16103b188eeae0---9935519010.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/85062428898.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024b5d56ff1---61274877177.pdfIn PDF document text
    • http://texmet.pl/userimages/file/49967531661.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612148ed39066---74960533.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb9ceeed8---641454753.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/78765150912.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2urolvdi1t08be0p6r92fvi7ch/19446392290.pdfIn PDF document text
    • http://isgsrl.it/images/file/37217085635.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/67592511425.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16968 bytes
SHA-256: 050d7b330d9d2d7f669181ee42ba67c96a2a464ec08761bc907d4e52a8ca3d48
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 10700 bytes
SHA-256: ac49a5669e135606de419e4453e9969be8b977f0067bd6f8648143f9a7e7835e
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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