Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3226a500d9030e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 06:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ec6a23a436ce0e32c6c66fe8cec15d3 SHA-1: a1de562a84e2657175c0312c8c85af4f6944a696 SHA-256: cf3226a500d9030e0e3619e77ba98369a8b071e863cc468b8d467c5fe1040eb9
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://olterus.com/contents//files/61184555628.pdf In PDF document text
    • https://cakenepal.com/userfiles/file/1442455818.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/844127914.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210805124409188.pdfIn PDF document text
    • https://etimes.mn/uploads/files/145244172.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c57be326a48c68b623e7f3832b5a580c/58957448902.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/xarogiwosuzizov.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/86da9c947e991ee6bfc8161445bdd0fb/84936206248.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/somutixokawebowalo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89dc15faf---zenosakuboxegefud.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/lawukufotezixor.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b595a418c74---kifej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7924c5c5---wanamawezuketib.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/19118609797.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/pufifubixijovaje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf837d10183---debafupulolutobojaleb.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vabikokitowivenumorisu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0ffa5ab4---nejagawibanugomavip.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/81812944297.pdfIn PDF document text
    • https://cargobull.cz/res/file/61735879329.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4d81ab679845f4f3e99b595610b89552/juzijad.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1817c9b5d---zolagobet.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lafadevumovakigitit.pdfIn PDF document text
    • http://winso.tw/userfiles/file/novolilafipij.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/52298010369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=accountancy+project+for+class+11+cbse+pdf+downloadPDF 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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 17656 bytes
SHA-256: 942b3bcb346755c359ac09e02f6dd22041bd69276335f037e330ca886bf05a89
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 11124 bytes
SHA-256: 0a8215a2765a09fbeb471adeb6f222e061d123c9b24b990ee9e3392f87959d10

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