Malicious PDF — malware analysis report

Static analysis result for SHA-256 36edd5a3b291fd94…

MALICIOUS

PDF

72.4 KB Created: 2021-08-30 13:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 194af1925a603067abff85ed0e22abef SHA-1: a41125bfdc81c2fdb6a073750481cec9c7148a0b SHA-256: 36edd5a3b291fd94edda217bda397a471c3475be601541219f624502fc04095d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to files hosted on compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0c06d9a2a5e94cb011a49cca6a8c008/62528946838.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d00f6fb8d---pogerejet.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/66320291737.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/43033656098.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/170872509.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce7d485995---49126036869.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xujafopanomawixip.pdfIn PDF document text
    • http://cocoal.com/uploads/file/merunibuliwewoma.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e1f72ae5---kipefinezukulanumuxuvena.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e624a56d7079417fe7e3b4bac728f526/wekagelilal.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/90352818200.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/61138603746.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/vorikodemunizuna.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021080100294641.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/mosipigatigomavoketeziget.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/492978600.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/85878887537.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/kajogisuxexikegatebilafub.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/xasirulisajetazetutax.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/97884064353.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/sotiseridagop.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/86317389928.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/zemutugagokutumebefizizuz.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zenuzipamolexapiwi.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/lowozedami.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e6vn8ge8hpds58pa9ekf9u5flv/92474355249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=breakfast+meaning+in+englishPDF 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_off0000b9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A8 10688 bytes
SHA-256: ae1bf8916b1945671ea8bc599fce32dea2e541a2e6dbbab63751016757457461
font_01_sfnt_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16148 bytes
SHA-256: e1240eec02cc49a8b4260718b7dbcc2e61ab21c545bc7d238b1c35e9768e54e5