Malicious PDF — malware analysis report

Static analysis result for SHA-256 142400e8c45e11bb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 19:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7443d467f37dc545843ada0503d8b677 SHA-1: 1cd8d0fbb093e4a2686bc8c7d2d32591a1df99e4 SHA-256: 142400e8c45e11bb24d07d5549ff43b2f01c5d0938a6034d2a965df7d67cf240
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple external URIs and a link farm heuristic suggests the primary purpose is to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=nox+player+zip+file+download PDF link annotation
    • http://hpcad.pl/Upload/file/maboxukokedejotojisimol.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/64229824293.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/96683561428.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/pojomutoni.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367df7aaa38---muratadipijivopokegoxape.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kimevawizejifoxofijapabid.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/tojived.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db32f2f26---lavul.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3641224---63087597186.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6f85969dd2e4de24dbcf74ac4e6dccf4/27689455342.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/53bcae5087832f5527c04bd353179ee8/71334469153.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/91337589953.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/85260699137.pdfIn PDF document text
    • https://arerp.kr/data/file///gazopexukigixod.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/xapovokotimedijutam.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/bireluse.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/25b3539d882a29dbba7e2eb9164dbbb2/nomutawiduwiva.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/fojewusokovitakotopip.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/24053703019.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/51269883946.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/95746846136.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6a26e6336---sewidisogoremej.pdfIn PDF document text
    • 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_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 18448 bytes
SHA-256: 38f6cb3de695625b8c28a32e7396db198900ec4f6568b3daff0e7a5f07feb938
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 10564 bytes
SHA-256: 9601fd2273aa32c4f816f9561b7102c9f29fb62af4ff6f2eb5a38b8bcd152f90

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