Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbb4fcb7df329db…

MALICIOUS

PDF

79.5 KB Created: 2021-07-27 15:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c41c032c18c6f8f38fc9be72825a380c SHA-1: 2196177b5b849838cb176255ff4ba51878bcbb2c SHA-256: 6bbb4fcb7df329db878368f4e3af7d95daa454a374b41930f8abf6eccbf417db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves luring users to click on these links, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/2148202470.pdf In PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/fexazajafamezobenizapanow.pdfIn PDF document text
    • https://flomogroup.com/upload/files/xagumujivakesativuxamon.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc50879d1---puxakabonesamezigofefox.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/dp1uthojg0iv5acdjbomnual2s/jebuvukeduxuvurev.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nosuj.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/fekararapibisuxifelubemes.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/vuwowapazafeto.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/torabogufoxinamezuw.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608084b78dfd6---10417431474.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/savinewaxevowedukelalir.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/07345f909d6126c812ccc588b2eac748/12209056050.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/luvogina.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zogawu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/8679849712.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5420b6b1---27701692126.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a366bf3ce01---finuresidazi.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/11183543294.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd24ae50d0---91274394438.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bujuwubakifoniweniw.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be55af97e84---betixa.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146fc7fb97---bagenib.pdfIn PDF document text
    • https://vpmemorial.net/images/file/7470099837.pdfIn PDF document text
    • http://wawa757.com/uploads/files/27980931150.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafca37780---jafaxitiposozaxux.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/lalomafosoxosoxobolusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ascii+character+table+javaPDF 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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 18424 bytes
SHA-256: 73f3c176a38d737fd4e7efa4f590c7f7e7fb1521ac5b0759fac6273b7e236d18
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10420 bytes
SHA-256: 3ef0942eef44e60aae19682609079539479e8fce33156134a3f74e7a1a71062d
font_02_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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