Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d51ced072dc20d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 02:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6657a7cceac11c51909f73258fca1721 SHA-1: c8de4f29fae114dac63380c2f07a5a90cc97ce8f SHA-256: 85d51ced072dc20d614f9ad2a043572dabc2c055016f5e3c6118bb3c162f485e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.padanguparduotuve.lt/ckfinder/userfiles/files/rumif.pdf In PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/91801793381.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/dadukagibatezibuwilapi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a5063f7e48244f13267f86f224e03101/78298900710.pdfIn PDF document text
    • https://mollis.rs//files/mobuda.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b46e810fa6c93f015a11918042c83f02/fizedoxuzaxefaporunipezu.pdfIn PDF document text
    • http://ktcz.eu/files/files/dufusunepimurutunoso.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b7df0a55---pijupur.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/zaponu.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/56042065507.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8j7mp52sf03qeucv2m6ni4ojfk/38315636844.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/c0sn7ab6lsvfb1j49lodjjeoia/wuduxinunupal.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210623_027D6731275E866C.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/88865384990.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/gabobe.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e13c065de857fc87f086c180ce6cc4da/69651275930.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tivebegijagonavan.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/68815669613.pdfIn PDF document text
    • https://tekartltd.com/upload/files/51861533180.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/jarigajegupena.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/85819800172.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ad42c798bd61a026a4ac12712d591e63/paseg.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4mbr4acftpvps6b9v9khddkap0/31820895155.pdfIn PDF document text
    • http://gyobel.itpublic/file/26304940083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=b.com+first+year+english+notes+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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 11300 bytes
SHA-256: d74fb4396259e808e7321431f9c9b48361d6e6a16961788f29702d379648fe56
font_02_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 18688 bytes
SHA-256: c92efa768d88949e0d3ab9319a9a5f2062d3b68ea06ac451b858e0b0a0f2c477

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