Malicious PDF — malware analysis report

Static analysis result for SHA-256 49643f57cf1ff20b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 18:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 456e6ad555445ef8ce845d1a53d06df6 SHA-1: 79ebad12d769cd9d68439e5644cd767f88591ac6 SHA-256: 49643f57cf1ff20bc6605205a22f5d03b9bb3a258ee1d877a34513f1a0d2c83c
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains, suggesting an intent to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farms indicates a high likelihood of this document being used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=3+by+3+determinant+calculator PDF link annotation
    • http://anticacarsulaeborzoi.eu/userfiles/files/66707489244.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e84a3c2d---63873175311.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/ladaduwej.pdfIn PDF document text
    • http://cissi.it/userfiles/files/sukumusefemamujaxunubun.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/lafutapukadogabemutevir.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/4679005724.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/91224860623.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a8e530ab8506f7215ba1c8856ff60cd9/raxijurukajitot.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a37b52bbb6b93ed53a0b90c93f4b7bf1/laripegoderarad.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077da4369673---94122128006.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/39916474455.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/443399866871c7d82853acf6df7d6165/firusavidizosoj.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160801155bbb5a---bisoxo.pdfIn PDF document text
    • https://wrd13.com/force/file/xafojibiv.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c6878307022611ddd9d5289eb1eba71b/38848904016.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/mamiluremorofirufotibezox.pdfIn PDF document text
    • http://mfahk.com/upload/files/11202909298.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/wuzubuzixuwaler.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/nuxeguniwuwerajefog.pdfIn PDF document text
    • http://mav-auto.ru/images/file/11462521810.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae3b0ca43e---78067739491.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/24212756791.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/voteral.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_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 10792 bytes
SHA-256: 187ea412af99935b6c0a4408c1570a3300cd3202fcfe1bd52c74301c80e2a633
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16552 bytes
SHA-256: f40453828eeb81afe187798674c8e2367a6f61f2d26aef5ecaa9bd5b5c63bc5f
font_02_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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