Malicious PDF — malware analysis report

Static analysis result for SHA-256 82474d1539972dbc…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 03:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67ac6072d393846f888747c4d32a08a0 SHA-1: 39736b93d626064d45e516688f825fa440db3369 SHA-256: 82474d1539972dbc02627cdd7d9cbc6b7e9b480a27ceed13b2ef964993e93027
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm characteristics indicates a phishing or malware distribution vector.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2242b333---30437491403.pdf In PDF document text
    • https://jhservice.net/imagenes/galeria/files/54768707950.pdfIn PDF document text
    • https://uangraja.com/contents/files/5516569273.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/jatosegopofatol.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kezazonuv.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/62859782191.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/97818625086.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367dd45d019---96605237605.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/27986365899.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.pdfIn PDF document text
    • https://ptogel2.com/contents/files/18752641679.pdfIn PDF document text
    • http://deauville.ru/files/file/linewusumipefebugesetad.pdfIn PDF document text
    • https://petek.biz/resimler/files/23792853087.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/rubemozaperozuvelojevoke.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38956753341.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a6c26f942668d43c94bb535b89a72638/7293107732.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/54745115090.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a0342426bf67356f08be43d91804d8ff/lowovafebixesav.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/88180194368.pdfIn PDF document text
    • https://o-dance.com/upload/files/28343331676.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136b923abf2f---40219048311.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/dubefajufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=no+mobile+network+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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 16616 bytes
SHA-256: 1a89f4f758a3d47e8406bda06ff515721d9ee124ad70e65d4b67f85571e7f9cd
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 10536 bytes
SHA-256: 798e561cc98ca2eee1cf746f250ec9483f95c4cca5f67cce9e42ab4647e351f1
font_02_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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