Malicious PDF — malware analysis report

Static analysis result for SHA-256 0daf456e3310ecf5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 07:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b58ba55a07c4a388ed7c9a702f033a06 SHA-1: f1c1acd225b4367582ade02f31a6044ef75e06a4 SHA-256: 0daf456e3310ecf513e2bd33e739a8134ed18c44325044e53d034791ca2aad84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.smartfutureexpo.com/ckfinder/userfiles/files/80942099777.pdf In PDF document text
    • http://kool-house.com/upload/editor/file/bivutugoxijibalabijago.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/43715050271.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/96366699837.pdfIn PDF document text
    • http://lachina.cn/upload/file/6098195367.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/8784893367.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/49160566901.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/in5kniimgbpkkvevkqmo5g06r1/vekefegopidukidowetuko.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5tqh6353si2fatf35puelj2fj/67801195723.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87dd9a135---folekitajafenowefenuze.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/10663424849.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/58229874062.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/visoduxotufupavebaf.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/67543476213.pdfIn PDF document text
    • http://haki.vn/uploads/files/15394345715.pdfIn PDF document text
    • http://knipia.com/userfiles/file/wijubijikomaxifeka.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/xemupisasaf.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/zatebuwot.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tixapanijeb.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/98333629521.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/pixivosoxorowixuwex.pdfIn PDF document text
    • http://plise.org/userfiles/file/26670048861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+add+a+home+screen+on+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 18064 bytes
SHA-256: fe0035f1bde9467904803cdc47441573cb8b9a67dce35ab9ad777ee3d0cb8e38
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 10668 bytes
SHA-256: f0f9c99253b775fe190a2304d4fd24db50ef42d0e0293c4fa456d70279b3dc47