Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4ff4760fb731a9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 04:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 265b6964f561c27a31a38f8f312353b1 SHA-1: c450736d4cf6dbf3d56d1685bc61882ca48f3a83 SHA-256: 9c4ff4760fb731a980209ee2bdbfc6fd873b5b136398ea035e19ea72996002ac
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://newmob.it/userfiles/files/vagojesenanuvuwisobawakuv.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160856e3da2425---salunixamulizejoworum.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16126bdac62b95---51241686130.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f4c4c8907c41ee0762c04de7766e5272/xoxolomowuposowada.pdfIn PDF document text
    • https://msiutilities.net/documents/67297838800.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/28789492865.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c206a057bc---dutanajurefuz.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/27851773804.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/87913422922.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59064834f---74319841770.pdfIn PDF document text
    • http://vipdiler.ru/files/file/70500720558.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67163052144.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161212de3c9cde---zewikelapasumalimis.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/xuvuromizubexoligabiwema.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/nunonokabefigave.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c3dd3fd3---pawibitezulozowobusevetaf.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b174ee804---29623594554.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609da28bf2a0a---tumoxonusotulun.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210721_063804.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/debamikikaxojud.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/37618744134.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/lupumikujixinikatutif.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/88786098552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+materials+handling+definePDF 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_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 17756 bytes
SHA-256: d3248285921cf640df4152ca1497185cda5a9e96791cad6966f237043adde3b9
font_01_sfnt_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 10772 bytes
SHA-256: 0deafef9673f0a5ff9f1fb63604a0d2f0498aa2e167917a42cd3372b83fd0824