Malicious PDF — malware analysis report

Static analysis result for SHA-256 93933a258791bd10…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 16:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0965c134d28fa59304ad23c872fb8fc SHA-1: 380b54acffe85e159bb3f298a15d40d523824328 SHA-256: 93933a258791bd10393c5bbfb0b85d458dd4784064c26ed8a56da89efe167a84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://chinajnbt.com/images/upload/File/sofub.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e10d67627---68579908029.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tesubu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/zilikafaxazezixewirig.pdfIn PDF document text
    • http://lblussana.it/images/file/vewiwozagovit.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pukunevibumuroxap.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/gufonibojedajiwumaperi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a6c4b91---26899720379.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/77395544123.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/lexumojulataneribena.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e5bc2308dc5fafbca293c1327e0b908b/xonopuxomanave.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b6b7a1202ff6ebc4c4d7443b74993034/tinoxamilu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/bazesizavemifowovimus.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/58446167769.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/91782227346.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bbd302d512e3f81223bec51d955e05c7/38598349755.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55943688f---luzutinakitikizego.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/13415143945.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/zizukamazoduzajudopi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4e6063a2---25759976896.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a202fac0---wazeguburigufoxodiw.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/neweronepawiredokiwimu.pdfIn PDF document text
    • https://service-panev.com/userfiles/lerixof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+do+mods+in+jedi+fallen+orderPDF 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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 10720 bytes
SHA-256: 73bdfc396938714dfa635360884648d67825d019a976912dce7343dcdb7ce71b
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 17944 bytes
SHA-256: b0cdf8847c5eccdde90ebc23814c478a7de90902f8d895862a5d35cb5fed351b
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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