Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ef2888e60d2490…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 05:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7600dbde0b372257b969f6f475b042d8 SHA-1: 454d7dbdd6e00e8b267270068f941a49c5494c22 SHA-256: 80ef2888e60d2490f4132de1692dab791e8f4fb181d91e7e75179846f5ed91b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://getadoc.in/ckfinder/userfiles/files/5841656217.pdf In PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/subuzedite.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ac644daa---zajozexudubogizitizox.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rozusokawikexoxasagesafo.pdfIn PDF document text
    • http://tecksco.com/upload/files/94695714464.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/49928988935.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bfb664b0a2821c5e4078c6354541471a/68037728141.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b91a91004---vibimumapox.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/fopinakafegeduxe.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/54014494570.pdfIn PDF document text
    • https://led7.ru/file/tobabokivexumipu.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109020558241461.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61988201315.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/venoxofutadet.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/vuzidi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/89416834612.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133525103168---kumakad.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/kemajakejazagutido.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mopepoxov.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2933308490.pdfIn PDF document text
    • https://km2804.com/ckupload/files/51339559804.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/62796695722.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108311704271762.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/71855986637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+move+your+apps+to+your+sd+cardPDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 17424 bytes
SHA-256: 589f793ee41a00acb2e7154cf9e3b2d4e5e1d554583e8f87f048971148b3ce51
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 10788 bytes
SHA-256: 8206a0af73afef4814679cfcb19ab74c7284530df6faa141ee837753d1264ecf

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