Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e4c92bbfffae96…

MALICIOUS

PDF

99.3 KB Created: 2021-06-25 17:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: beb43e11cd6951ae779273cf25b6292f SHA-1: 487d5d1cc0b0bc56a12e50a2513237e8ac840503 SHA-256: 81e4c92bbfffae96e3da7d4c6a8960425bd3d14bb0bd89ff4ef9df7c785bcb40
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a phishing or redirection scheme designed to lead users to potentially harmful content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bukhatirhomes.com/userfiles/file/34247670609.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/npsnrfg8tm7nk1hm3l0nolublh/16439190540.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/94557444044.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2badb47500---basuvuxumedofifopigu.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/fotirozakumadebifademi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/dvb7e132pi21ihmhpov410i042/sunakogufekiraniwegi.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/88214507763.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/21f61203d9a14f2e7b2d703e830af4a1/runododapujavinusig.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f46dedd486fb19595c72fd5575344bec/sawewusojafaniziwo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42a4d1cf9---bekikolarosafukel.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/76561272240.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160951b727479b---23833647377.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/lenopojofiporujexemovupa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd9475230---pumexisutegidakifujof.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862d3ee3940---tilazamev.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b65574792---97678502908.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb94a58ce---batisobukifavuzafevowoz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a613733b---rewojine.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kajetozisitawotilupan.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/59067903354.pdfIn PDF document text
    • https://educhina.mn/editor/files/bolifudinivowabonage.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8d8ad944ec6e6fe730c21380cdad517/69455156545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=printable+bible+true+or+false+questions+and+answersPDF 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_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 17604 bytes
SHA-256: bc3392894a0ca689a58a042ae269d460a7aa68d30036fccf0a98718a079961cb
font_02_sfnt_off000166b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B4 10820 bytes
SHA-256: 33ac3a217003d6f049f9c9baa61b7e0de71c8e28bf31766521e3a260dbd97d20

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