Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d9ebb744685df3…

MALICIOUS

PDF

74.6 KB Created: 2021-06-30 04:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b573559f16828b7276fa1f62f703dbbc SHA-1: d06762802d562066545b5f13e80a0ff7e987e3e9 SHA-256: b9d9ebb744685df36de92570a19daa9f4163d041e71afa908034863cd9d21c0f
156 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6e9718304dc530dda51ac4e1c743f85/tovosugu.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/fomepunorunikeraforikelu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e82168c79---vowenafegasemoj.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/46481803515.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44681063199.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xabusu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/780409c3ecbe5d239a897da6eb4776f3/95249877075.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2a74dbb4b32ba8a74f92556a72862f16/40310768255.pdfIn PDF document text
    • https://tempegaring.com/contents//files/vufijopitekidamoxedigo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s2hu6raqrj0nab6hl4kui7p2s5/51736579616.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d32c5a415be1e7f4852365cf50988b0/zodovoto.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d9c75720---50254339487.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b82dca06---25300592296.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cb285d51---wivamikidirebesuvabobamo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/09379ad24c192c055d87b2da160e44b4/74735749913.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043018101573499.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acacc9202---wadilogimiwagutasuvi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/punuwaku.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2rk3phgf3nuhhs5fu7aqbn1826/vilukokewigisaz.pdfIn PDF document text
    • http://mmcaana.com/clients/29274/File/13933583792.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094288a147b5---mugidujunumudoj.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/bcde63e8ed38cf5a2be001e335de5803/pusuxuguliwu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/20342820491.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b8bf1230---labibiziwik.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607827e9bcab3---35747940123.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e198ae6f20767e4a9c7b98d82363bcd5/ledubonorilatofidoxif.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d67b602e687d9618f0dc61dabc95fa91/zikepawosadasex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=electronics+devices+book+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_off0000c1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B9 10732 bytes
SHA-256: be4fbb75d6ad26ec0b2e35b7a606b2862bc1ac3dddff178c7f9488258abce36f
font_01_sfnt_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 15972 bytes
SHA-256: 764422b1b20c17dce6bcac2e1f1f0f071f3935a50c46339915968bc28494aaf9
font_02_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1