Malicious PDF — malware analysis report

Static analysis result for SHA-256 586f13b485af2d68…

MALICIOUS

PDF

102.6 KB Created: 2021-06-30 15:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7024c0d5d3a26a189623078f6790fd5 SHA-1: d5e49608a9db697e07727c4c84c75ee8f4bd3f75 SHA-256: 586f13b485af2d68eae1ec3317dd2ab790cc08cfb4b37357d636ed34f172e9d0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple links on compromised CMS upload storage and disposable hosting suggests an attempt to obscure the true destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://files.ibiza-ferien.de/file/sutuzadejibiguvodolug.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/wipusoxovirinefajigazeri.pdf
    • https://baigiangtoanhoc.com/upload/files/rufemederufusaval.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d773136dc---76797799328.pdf
    • http://businessvaluationapp.com//fck_files/file/govuledozimomug.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6969de0cce776f86d37198c991c5149b/lofusudogofo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417fc2cf5f---60238672339.pdf
    • http://przedszkolenisko.pl/userfiles/file/lusagogawemipasewub.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a112ba9402---kubopok.pdf
    • https://mytopics.it/uploads/file/92394696373.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16096af250c3bd---zofal.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893cd8962bf---metonede.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/58601087786.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2c02b1e5910da4392a008783be513d72/16792094123.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c1c83624e6629c2b4a075237ccbdce1/59931111873.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a7f7288362d19da6bd79c12c3c02984f/67241138353.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ace3e30d6afaba797a0ab71ae2eddd9d/vuxozeladasuxexelijaliwir.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sakvenuji11ur23s05msoei40q/65112418945.pdf
    • http://capmar.eu/userfiles/file/99096999395.pdf
    • http://peaceinsrilanka.lk/userfiles/file/75664918433.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/35679450633.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b491a72b5---nozosinimixowudazenovi.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e4ce3b95---70054740898.pdf
    • http://accessiblevehicleservices.com/userfiles/file/67091989875.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=call+up+meaning+in+bengali
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013725.bin
f6cdac0307154d4a1631efe7aae077a2dbea7f2dc219137f92b604cbf6b536d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 15272 bytes
font_01_sfnt_off00015df6.bin
5959f84eddb37eec831bcfa7206bfef7ad54cec068cba84d5858958a1736ef55
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF6 10380 bytes
font_02_sfnt_off00017521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17521 16792 bytes