Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a59437a27609176…

MALICIOUS

PDF

105.8 KB Created: 2021-09-02 07:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5875902e8cd2443c35d63366936e178 SHA-1: b7bb22a9894859f26f05a2c491f2db90eb762f0c SHA-256: 6a59437a27609176ad4c4f9e90c87defe614bf5f91fb46e2377cfd7527d2f12b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or download further malware. The presence of external URIs and the link farm structure strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=bibliography+in+table+of+contents+latex PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acbafb93bc7---mewuxib.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a37f546a62---guxutezipox.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/93811938533.pdfIn PDF document text
    • http://safetruck.gr/images/file/noguwifigo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/19e2cefc79068df8cf392fd3459040ec/89668140773.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8b88927490f30fd2368cd20f9dba0baa/rakanasito.pdfIn PDF document text
    • http://bociany.sk/media/file/32584224466.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe0917f96---xaxibexemuzarurewiluneze.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47371520018.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/27884255042.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b02lviorpn6br8ff0a33q3ppnj/mizifufuk.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/golokalisine.pdfIn PDF document text
    • http://erdbau-rauch.at/bobaruzosafusiwinowipuku.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/zigapobeterafekivemi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8l9q0vh2jaghuchrle0cl303uj/97052538107.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/25386106721.pdfIn PDF document text
    • https://duel.pl/userfiles/file/jotuliguwomoxi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pomenudukonelepuk.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77b0d8aad---tipibusupep.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/90499557040.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/44791546629.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/febusuva.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/99164869134.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_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14992 11168 bytes
SHA-256: ae38462e8f875a0df0f131325c7a78ec3d222925a03ad788fb52b74a9d431c6f
font_02_sfnt_off00016376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16376 20128 bytes
SHA-256: 7a9ed647f4ec9dc3aa1d6e0227b30a0ac678896fafedd8d69be92153f949600e

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