Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9824a1703c91cbc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 03:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39bbb7c947aaef5ea034989dd8b6f888 SHA-1: a8c3150f9606c0d484b18b9c3f2ec64ea260d4ec SHA-256: d9824a1703c91cbcd94804c1a102b8f72917d60815c6769a2be817e673708a73
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other potentially untrusted hosting. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV specifically identifying it as a phishing trojan. The primary function appears to be acting as a link farm to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://prodottoitalia.eu/userfiles/files/kikezovelozatigeweraw.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cedaba61c34---zetefinelusirinamuguf.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/jopolofibetutava.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f0277e2a7df---7226134522.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/14216724081.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/kejusaxutof.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/warozedefajago.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tvmfuroturtau7k7cfcgmr6ec8/nodageripaviwisex.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/kixodati.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uo2gh4dslr54oe8h0na64hci6s/37841612779.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/67566089511.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/46997453545.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b0f328cc2aae88241bed796a24ac476c/nexefiramoruposinogipov.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bavaruwofabirobejukuw.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/88042231015.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/97683808321.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607545f69f6a6---67555155589.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/kufozilizivufadulobibul.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/62256739960.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zekup.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3c43745422d1cdc412b111ddb3cfded0/wefegurimamiderisi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/virezolitipuvo.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/domuzez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cortadora+de+plasma+miller+manualPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 18440 bytes
SHA-256: 1a2109f3d208650fd80d90f1219525fb868b842f4deae2e1c45fdbe97e9f5f04
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10684 bytes
SHA-256: c6cb665e293367ebebbea90ddbec5644d188ff984cd3ce33da55076a6ea1955e
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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