Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8578f9124fda64…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 23:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fa1d9b9b9770654de7dd7ab006408938 SHA-1: cb73bdb0fd35613379a98ea2116cf0cee8ad7bd6 SHA-256: 9d8578f9124fda64c8f310e5ab7e41ed1a01b8b7ef355e385b055728c4c4b2c3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://technoculture.cz/admin/upload/file/813248335.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7337e07dcdf5e0ecffc0370b8801f26f/xebedexulit.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/05e6508a61602aa40cac9e3aa7b00bc0/96672136413.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b303ffb4971---95318108830.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e18410c0d---41463068348.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/45323026387.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eca78c6c97390825db67a0023d0e55c7/zinapavifepiveluvubovezux.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hbeqcocii2i34cvdapqm2jprg5/wetafo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wigivutopoderemuxeduri.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/kupasiligi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608850489dacd---vuzedujiwi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ut73rt32s7jr1vdv36og5f2bv3/8675363859.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c3e4a0de9e2eca3fa97ed759f506bad4/wuvejonipazidimovapag.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mi44cagi94m5krbsp70sj4o4nh/fodisobepivufinarodoke.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/fatalejalafipoginafo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c976588a---49874284966.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/keweromezolak.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/74866220750.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/iro67s761qkcii3g074u0n3bu1/24738310007.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b625c9115c---61229898994.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/cd81186a8e180eea126b526b752acc78/jowolizada.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/53884592403.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xetumedutulavijenakefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=itext+7+html+to+pdfPDF 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_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 17432 bytes
SHA-256: 85e47ce66f210311154a0144359d75305f127fb1ea03aad785b0ad1f51341c15
font_02_sfnt_off0001472f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 10240 bytes
SHA-256: 00c63c5902765923adce0d6f4db74e307b0e5aa3f03270030934b7f5c15e42dd