Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9b11793eef71aa…

MALICIOUS

PDF

83.4 KB Created: 2021-07-01 23:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29e2e574f34e3346d9ee4697dbfa6a55 SHA-1: d8d9be9286c4d1b5f3378f3cee3d351644567709 SHA-256: da9b11793eef71aa4dc6acab0ff6c3828c4b703f94458a0e215a24e51044ca72
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, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute phishing content or malware. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=canadian+geotechnical+journal PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086c891dd0b1---ladovepibuwigaret.pdfIn PDF document text
    • http://2440027.ru/upload/file/jorusekexegaxiwedebifimel.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e5768f3929f4488cad27ae41c91b5a5f/25964544757.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/lepolitogemabawizagexo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3cd872b15f6db50cb7318bab50a38ce8/9281639576.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5nmnr9f9pdpauuahminuctv1f5/94247774154.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/c04646f5doqodogpp27fenhslv/85688056828.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/suwefuzajewaj.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/xupifeloxigi.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/zigezonulomuseta.pdfIn PDF document text
    • http://mega.kz/media/upload/files/60867474077.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/jivexemigim.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/50481748208.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ca51d678---65350164698.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b7167b07---supagan.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/81286538133.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6092ce379dd8c25334c467ef205339d0/varogegis.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9c9a06514e9303587afec1af40f4629f/vamegesutimoza.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/pivetugawijanov.pdfIn PDF document text
    • https://kopari.hu/files/file/58569593021.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/sigexobumi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/13303049302.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/85365495596.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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 16116 bytes
SHA-256: 78c50e8b2e0e2cd5eee72f1ab45c0fa41e926954a3369cdc14750c3df7f0ec58
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 10740 bytes
SHA-256: 6e4470895d82488a1217aa610cdcad67e90e52ccc950c73ae90a92e767f381dd

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