Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d4276b1432b5d2…

MALICIOUS

PDF

83.9 KB Created: 2021-07-17 13:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4ed7c888a8b3867dba29d3e577331f8 SHA-1: 790b9d4f99c70c9368e8e2598ada5007e593e86c SHA-256: 05d4276b1432b5d21c6e081a336e0629269ad7c34abdc5430d48dbd84d91b982
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8075ed9d---14270234652.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4365188cb8---62977762728.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/sifavu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ab71e13d---45551429520.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zosizusuvudigeti.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/tusalaximutefid.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/76938872162.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff95194d4---52256443575.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/590989289b07e6f47e4ae3721d540bc1/96433857713.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/xevexarerofasod.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/puzekavifejegiw.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/33438116558.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160add3bf5cdc7---66307915829.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/27876463309.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/wawazelabinoruk.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/konozamodepezezudimum.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/wabajexokelozerobikasin.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/11577388699.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210627_608C0B2950CDB0E0.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/53350151456.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b9832d2e3c779551cb99a543398cf664/gisifuxemazefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=isotropic+and+anisotropicPDF 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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10280 bytes
SHA-256: b38494708ab047a54aff20996eb09586342f6109bc44f868e85b978ee136b563
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 18316 bytes
SHA-256: 3c6ec1955f031b2f3eded6881b6b7cf61afa7a0201dbc30081c26a1063163722
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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