Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cdf60e55cb17eb…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 23:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43082b1a7d10ee16d863f92de39855f SHA-1: 22fae67af6f433ea74b6c8c67e2139deea0045a9 SHA-256: d4cdf60e55cb17eb6128fe4f267b983cd4afb985f631ce35bdb45dc636e2ec8c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crewmak.ru/uplcv?utm_term=igcse+chemistry+alternative+to+practical+revision+notes+pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d845ec3c0---toredopusiw.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bb03da49---25481981736.pdf
    • http://ranaghatpchsschool.org/userfiles/file/jamiruwugumudidipisi.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4230d3ed---93108813968.pdf
    • https://bamor.org/userfiles/file/mofubozituzalujopapod.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/54eb47208fb712054be3488686618906/33081040882.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sbtesg95t164d95t9lbdvb5i68/tomugexetaburadama.pdf
    • https://bouveau-consulting.com/userfiles/file/76184251372.pdf
    • http://tz5168.com/uploadfile/image/2021/05/20/file/20210520_061747_189.pdf
    • http://www.aportecnica.com/imagenes/editor/file/mibinuz.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rd85om61jcbuuvcvqpgtn32baq/zufibesa.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/of0k43n0ira0lpvoi4jffmk13s/5246341051.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0dd767e9c8cb42a80bb2b2859583ac36/vemusir.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/21j9q5vsc2a4r8aa8p4k22ggd8/52151418736.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a390e3ad8f---78673655163.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e318.bin
9043e24d4effd82c5e0092f99f0a5cf707a530518707770c8b7661e46976c183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 5668 bytes
font_01_sfnt_off0000f64b.bin
d5bc2d548acac79dd6707f4e3a7177294d51e87eaa44346b8896e22c94fcc2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 13264 bytes

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