Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7704141de119a30…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 12:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f571ab7f1685be06f20c869bc93b0d5 SHA-1: f98eb1292279678221071f6b2dde3e3edf194bbc SHA-256: d7704141de119a30a378fd1ede2cadae37949a9b9dc54589e8267fc199fac897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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, directing users to multiple external URLs, including compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to lure users to phishing or malware distribution sites, aligning with the 'Spearphishing Attachment' and 'User Execution: Malicious Link' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=android+box+connected+no+internet PDF link annotation
    • http://emailreceptionist.net/userfiles/file/47537413890.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/venulekid.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/77445598017.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/majul.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/73885746704.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/77942953946.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109051626169751.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/81809294201.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/pemiwivalibadupubonasegir.pdfIn PDF document text
    • https://aashianarealty.com/file/58730477827.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/34491542384.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6dd00ce6---paxovugot.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/23334155279.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/48831c098fc3cb7412bcaf60ada6a9e0/tojuzu.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/duzorejakaligozuxajopuzag.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136720f72b62---48844393488.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/61349856374.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137509aa2059---savepizamorozokigarixa.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/84415974740.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/25243219540.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/pojisox.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/78271388601.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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 10208 bytes
SHA-256: dc6444ce785fd02825e1397e1ea51af06e96558b5e1341a090be7b9805b1bfc2
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 17584 bytes
SHA-256: 4f2c3ff637913f91089524b7afa8c675e178c8743c81e32528de2d6d8e1d7547

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