Malicious PDF — malware analysis report

Static analysis result for SHA-256 020811e64c9729dd…

MALICIOUS

PDF

85.3 KB Created: 2021-08-03 14:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 57276ba3c3ef7a813a62d59458ab21f9 SHA-1: b743df14bc5cd64717f9137419cd3ba1a3aa7609 SHA-256: 020811e64c9729ddf3c2733a632874d87eb78f2b5fe9202db04d784c49c9bd33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://i-biohealth.com/files/riduronokefutizigarorelo.pdf In PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/62129172627.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/19607d6ea35f78e0054312050f3f8e41/4802461979.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/41906951747.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/saparotofaforufasosav.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zabidosimizo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/89d0223bc99a6ad2a672ef3cb06dbe4e/65489401581.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2kde5q0amcrvum90djnnggi15/dajufoxo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a887d60a59e---funamewun.pdfIn PDF document text
    • http://chromavials.com/d/files/60270865357.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160775e787907f---notexuju.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/rivuvadeseloluwun.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/ledalakivawoxaliwanikur.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/defa30f901f3522be6a7f1de78bdecc0/lamamiwani.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/23390780171.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/e2qbjgcf57j6sktu87bi0esfvc/metusenenixa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfc4a3752---45581931734.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e8f5c6f5---46393628343.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/jerodijazifunulebakow.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/13eamlipis2k2veq9hid8g3b13/kobuzozamasexixevibomazi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8922b22233a59781e7b4cd3f58d7f675/93126096418.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d2e51d421cdc2f3068f194bd3c20b333/zifatugetin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+mineralogy+nesse+pdf+free+downloadPDF 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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 17244 bytes
SHA-256: 505ab2e1dea8c8ecc20a91b192807613f496fcfb2e1e31bb7cb9debed0d3bd6f
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 11212 bytes
SHA-256: 9b8cdd8d7f7c83c500dd46d04a1a4c4a8c72bd94b74c901701608f8a48036152
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1