Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3fbe41d36ba386…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 11:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdbedc22e793a4f49c4c73cbe0039119 SHA-1: 4eb257f255e78243c502720f504e6a1ddc6b0756 SHA-256: 7b3fbe41d36ba38624ce67b81debff4f257c5ab93573d0481c4a0878e129c504
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing numerous links to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=manualidades+con+material+reciclable+para+ni%C3%B1os+de+tres+a%C3%B1os PDF link annotation
    • https://alianzatours.com/imagenes/file/davabiwadakezewu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/90afc77b92ed94908440942c74bcdd0f/gunitovozapibadufuselenug.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b6a8fb29---rowekeliranoga.pdfIn PDF document text
    • http://com123.vn/uploads/file/mimuxin.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/fazametiriwekaf.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/250475c2c0eec4d3b763fb1599bcac56/5383621261.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/fijetokamesitatumijog.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b015d00126c---ragivagaraxar.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03ee66ecc---3684226918.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/90638810117.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads//files/202108101030103605.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d03737c26d7---86552129206.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bigiwimu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167ad1e39e8---33704648118.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/28497580043.pdfIn PDF document text
    • https://tavio.ru/files/file/22082757920.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210722_224247.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802854a5c6c---melowij.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/zafusabobigewezomaribesuk.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce25f51f29---46150322205.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/83880143571.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/wulofib.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/25035721021.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/45490380048.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mm9kb2ino5aq77lr7nn6jqcofd/zitawewufigutonababetibug.pdfIn PDF document text
    • 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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 11112 bytes
SHA-256: c4f5418d025c65e41868db9edad9a322d9a52efcc930b3065082e500ac9d3786
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 19824 bytes
SHA-256: e1b955fff6bf57a9503483e595f475122c0d99d2ca921a398c5bce1908b1b944

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