Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76f4ca1fbb07879…

MALICIOUS

PDF

80.2 KB Created: 2021-10-05 08:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d63c67c19adde73bd49214e055f1e752 SHA-1: 78ab19f6e598a83695f16ee41d44342c2e93586b SHA-256: d76f4ca1fbb07879fe807d1a1068f7186fb5cfc709837f11aa9b85f19c08b9fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, for malicious content consistent with phishing and trojan activity. It contains embedded JavaScript and a link farm pointing to potentially compromised sites, suggesting an attempt to deliver a secondary payload or redirect users to malicious content. The presence of embedded JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://adas-muko.pl/photo/file/71141366935.pdf In PDF document text
    • https://vialivonica.eu/userfiles/files/sosin.pdfIn PDF document text
    • http://gespk.com/userfiles/file/13157533381.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/xajiriwalujazu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/vujevudeselinupa.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6200424e---befupokelo.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/29078659475.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2072b64c---wasirudotosen.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/rukipadapurekobituzu.pdfIn PDF document text
    • https://blugarden.eu/file/benijugodusegugode.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/nogifizigoxanal.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/sodenazawewaxavimamajipar.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/rufutojafebizelamo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f822c92b2b---dawiridaf.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/botanuzonuzolutajabele.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a2001330---62438070475.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615717d32bdeb---49751106306.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/luxerilan.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/8360048329.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/gasoba.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/75565077936.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/35865355619.pdfIn PDF document text
    • https://hobbypet.cz/files/file/gofipepit.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/rabudusasu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6e1d6ed3e14f04bcd5507e49e11c216b/25710402064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=happy+anniversary+2+month+wishesPDF 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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16876 bytes
SHA-256: 25e45c17ce1e0b203635905ba1dd7da6118bce5e3b18aca494a1b5f31faf3140
font_02_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 10848 bytes
SHA-256: d834d6e52645de4c5fe43bee7f85dc916532f2292179694b47a2757dfd72c575

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