Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad7cdf64ca181ec…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 10:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6caa62a7897dfe0605edd2ebed4acae SHA-1: c860746ff2632f53c92d5feca71df2136e3b1a97 SHA-256: 8ad7cdf64ca181ec9f263d83be36f9d1e2dff4867ef2b04d7071452fa097ed2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tataservice.it/userfiles/file/50870929977.pdf In PDF document text
    • https://duproject.com/uploadEditor/files/27540529541.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bf148cc10eb965bb84f1331a51269985/91724208119.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/79829418533.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/92208146296.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/48951451415.pdfIn PDF document text
    • http://land89.com/ckupload/files/68975223366.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/26663751500.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jabug.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/55604976843.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/bixazetuganolobunatu.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/2758086657.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/52625947722.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd34caece6---23498490618.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/1466586504.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14126179140.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/42764911925.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613625fac9dfc---rinuwavutakifibojudilago.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/28540070976.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/17872077734.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/94413832670.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/82543380062.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/musiwosotobim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+more+alarm+tones+on+androidPDF 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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10668 bytes
SHA-256: 8f9b63c55c86f77e8af7e23085d68b1be253dd9ff6e75ccd505d003f25b14f73
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 17352 bytes
SHA-256: b12041a03cff8280ab3f288bb77eb26c76d59da01549522d8132d261b4cc3c72