Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c095fadc517a389…

MALICIOUS

PDF

77.0 KB Created: 2021-10-10 21:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 92ca3ed5af17e168a37f0da6cad769ac SHA-1: 2c6b6a9283e41f54eca1a8a24cfc5b00bdf97e1b SHA-256: 8c095fadc517a389c7fd391576df74c25d11a518517b8fe59cf2154b25ec74f7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains multiple links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=charles+poliquin+winning+the+arms+race PDF link annotation
    • http://meruzhankhachatryan.com/app/webroot/files/file/38931713364.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59320491869.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/11769316553.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/16273358879.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/ditidipebuxudexeso.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/48850397251.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/10487722794.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/sujurafipes.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/leremimosokamaladiw.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/77363084713.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/xaweta.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614855e24a172---sibele.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/47073791189.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79028772002.pdfIn PDF document text
    • http://houselandia.ru/files/18334710025.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/51054161858.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161443b90eb121---58351172683.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fioimjamuh5r4ivdb5tl2ds29c/zinexi.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/76248857676.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/jugimelarezutidivan.pdfIn PDF document text
    • http://olympusflights.com/files/files/gaxinetarifowizufujuvelif.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/19394917086.pdfIn PDF document text
    • http://bastola.org/userfiles/file/96344706276.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/88483329221.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_off0000c294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC294 18864 bytes
SHA-256: 39fc7caf31ac73ee5133dc66b72e7ff154f2cb9eb4ffd50c9cc5a4e5d1bc4487
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 11184 bytes
SHA-256: 14533cbeee66ea3b1afad5616fafde1edaf979cc0a05b1f4c0c41de79b32397d

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