Malicious PDF — malware analysis report

Static analysis result for SHA-256 056a1b5a85bd8966…

MALICIOUS

PDF

88.2 KB Created: 2021-08-05 00:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1ff6ee2f68586fd39d4a6a8fd38cef28 SHA-1: e79de4cc742523b6c813b84c6b649e5d1634c5c9 SHA-256: 056a1b5a85bd89665ea01ae60266e50dd4f62428a3f4851765bfd74dae706a56
156 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, including those hosted on compromised CMS upload directories, suggests a phishing or redirection attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://atomleasing.ru/media/File/lovovewexisasajufozubafak.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/da81d4f0822974686f854e0f2387b99a/xukituzivefexevubuposamif.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gedimijexaxuxadufodigegul.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/fiwara.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/dudazapiwidazujaxazul.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8c7d2d4a---wudilolatexefazodajavitir.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/79681730310.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/jusadubowenita.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kq4spku15mrn0edmf97ur0qc12/tafisovepurevegosapamej.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/07395742e6edeaec2ee2c19d20108eb8/10133206366.pdfIn PDF document text
    • http://canoeing.by/pics/files/33331025243.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/8817584006.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d4a7b9a5e33515883fdcfa068b5384ff/29556109613.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/903bc9aaee04381270d5db3d30aca8b1/88369691786.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/64970307509.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/ninogawivujipipujopesini.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/bofezomidilirev.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a4e907b6fd3e8febc2d292d37644f7de/27196272165.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/66508442593.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hgnmkhg090ngrf8c3pekmi1eaa/56008021127.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/91501746357.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pewevipow.pdfIn PDF document text
    • https://thepainter.asia/upload/files/26159324803.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/61284756273.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rexojanujup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+answer+during+phone+interviewPDF 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_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 16620 bytes
SHA-256: 20c21e781b2b5eba1541640d8b519f6294c1375b284b06aef5d08bda9c5860fa
font_01_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 10868 bytes
SHA-256: c109ab1ab7b1eebe06b6849cf1eaffbf81c3ebe173d8f2d826678034b766ffa3
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1