Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0f1c602b4f7e1d…

MALICIOUS

PDF

117.8 KB Created: 2021-07-01 12:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 82245110e7f556a910e0a142ff980fdb SHA-1: b7a1ac526ea243c2604025bfefa8967b8a347037 SHA-256: fe0f1c602b4f7e1dd351f93f3875649abd26d991bba0c75c097aea0887871e05
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. These links are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9234

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://batikatravels.com/userfiles/file/dosaduxumabujorigag.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cff2680fc---74755421762.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b075baa1061---wazugujasafokusodumanam.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c2d48f76---57671783369.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077b69fb0849---pobeb.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2f8c3cd629eef69cc2e81c356f497aab/kilamipasaxugovuri.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff537e536---30850012698.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/dejazixulimolax.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9551cea5176ee18492592b0c2d0c274d/popalejades.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/hme0aph55ig0tq9f6c0kq9u3fk/5597334455.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2cae1747---673939477.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3503a930---tufubured.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb2acf0a5---fagij.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/f3fmpfk67qkftelljn2nn1l4o1/2165291146.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/piluva.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/23223279932.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xuvazupi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jumezom.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/77545642902.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c40eed2a---legodutebotalaju.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/buxewonevirefowajuz.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/47280760390.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/purasexo.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/tiramare.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5700c08f---xejinesinuzarawe.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/popibul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shironeko+project+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 29604 bytes
SHA-256: 12b9b3f8038c82f7f4008756ae88edbb84e7ea2550bd29101523dd4cc38d433f
font_01_sfnt_off00015102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15102 18404 bytes
SHA-256: dac169b38dede4b9a178922b572ce1b81fe9f4abde6b8e07c2a5173a380bc089
font_02_sfnt_off000181b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000199c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199C8 10696 bytes
SHA-256: 12b9340722db8b5def14a720bad01281a209a22b4a14cbc35323cb76c72f93ff
font_04_sfnt_off0001b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B235 16440 bytes
SHA-256: 034788338c6e0990e4d795bd7f21f4a61c151469f928689100e36de789c84701

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