Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5a42cfdb643bb2…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 11:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa5a2f4e9906c1fc84722e7335cdf3db SHA-1: de67f3cdb1aa1d7558c14fafac1d3a9e2f7569e0 SHA-256: 4e5a42cfdb643bb2c4c49f3eadc14455dcbe71f59a9a72854ab1f899d22e111e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://coretry.ru/uplcv?utm_term=unlimited+coins+app PDF link annotation
    • http://infosierra.es/images/editor/71406957368.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/3541413998.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613952f67a6a8---lopijisajadodogevu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/13860944414.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/90544849522.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/20688639077.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ff7c3a40---fewibodapolawuxape.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/87975446417.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/wogeramowesagiwiwiwirade.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03b23a586---joloravilaxonikimape.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/xufirani.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/37019852834.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/pozuxigobu.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/74467586353.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3d94eda292c2e5cfc94c7d0980e5d098/zifabi.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/wegivinefevovagiw.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/48129085353.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/96858690013.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb4857933---dowilakonefurorod.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2449bd252363d60f0fa4fd0c7669e441/9433561171.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/32437478384.pdfIn PDF document text
    • https://kimcert.org/E/file/xafigagegelajawusatonebir.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/98985251176.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_off0000afc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC3 10580 bytes
SHA-256: 8ad441cf15dcfc7176d8ae9de29cab59d1fbf41d2e552923a5462dbdc22d55f3
font_01_sfnt_off0000c7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 14428 bytes
SHA-256: 35038c495b039a0377eac7d7b02d79efdeb2f1e31644c2b8b39485fc8e69295e