Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acb8202a1ec3cf2…

MALICIOUS

PDF

95.7 KB Created: 2021-08-09 08:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ead9ed4b707b131af6aa29101cd0d3b9 SHA-1: 00c7d1ff814d6cbf7f3269ad283da03302f0718e SHA-256: 8acb8202a1ec3cf29aa40a01201d2762a464f141906e41cca33ae4bd5eab4817
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://bigxra.com/uploadfile/file/2021062501561073499.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210610_41ff4.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/77043731305.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/fasuweloreva.pdfIn PDF document text
    • http://elitvorota.ru/f/file/88008858649.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/33681534168.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa34cf37d89---45347690454.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/62220795950.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/kelenenowomerikibo.pdfIn PDF document text
    • https://mihalex.by/files/files/tuvufufozo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/63422011841.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e08390f3e---dupozilatomawutesu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/xuniti.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/muzipoxa.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/10361107558.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84d61c6b3---mubekifalo.pdfIn PDF document text
    • http://farashimirooz.com/files/junaxizosiw.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lunebumuroguparoz.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/78394317904.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/807cd53ea1496c20d66761feae2cbe05/zalaleginizaviweka.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb98e0751b---polaxizupu.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/dibasaxu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091efdc590e9---46165368167.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4d3fe0933eb85af511903a3e625165cc/binapudop.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbc2a49755---doxugoporo.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210726_AF3EE3B47EB549DC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=el+libro+verde+de+la+bruja+solitaria+google+drivePDF 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_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 10736 bytes
SHA-256: 4cbb2bc182f99d73253a7ed2e8b5d53e7dc5369f4e84fc7b848b7c7da4915c3f
font_02_sfnt_off00014034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14034 18164 bytes
SHA-256: e59018f17cbe67f303285b058d6be9c65ff3135b1bc2c353100fb1d10997d322

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