Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba71a7e004d710e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 14:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 504f1bbb39e29131c3b6533668e778d1 SHA-1: 949adac2f7b74711ae73c18eca21a4b4e0515eea SHA-256: aba71a7e004d710e955393c6cd4cafe6f32f22b782c1cc2e8fea04abfd8a35ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable hosting and compromised CMS platforms reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/268eeaa15e35c1139cf616c152139867/gowanipi.pdf In PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b7feb5099e78ebb446fdf6eb02193a23/gamekopogexisosor.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rv99gjsb41rpl0gb0e3jmd8d67/45139547239.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/30907352904.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/89002788516.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2e032657adbf59e13208099bef311706/90206408869.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/8497227858.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/81307078077.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/989bb11356a372513e013e92810a5a8b/69090888370.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/begikuvixenuxizawubugeli.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/womasidesofajubegow.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/nugogaku.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c28865ddb---17799313997.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/sugunobini.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/60540286226.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/19837288995.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b02df84f---zelilubuwibege.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/81804877444.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fa150957655e3b4e58f35cb253dc6499/mogenedobit.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610069d8e8dfe---sitisekesupixe.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf5054a91---6030279776.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3784270eb8dcc13656b014824d0955d8/kototef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hebrew+language+bible+pdfPDF 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_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 10604 bytes
SHA-256: e8327f97040a850cf46ce16ad4224602f28a68d887c0bed6acc88e901a12d384
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 16716 bytes
SHA-256: c952e2cd26224948898b011199621ce3000431e25dd6575defd3039d23f3f529
font_02_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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