Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c273fcc3f27b4a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 20:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97f08b880d63ca387c6d02e89c6db8a7 SHA-1: 573bf3639dc9ec16bfdc1479bfcfb329fa7167fa SHA-256: 84c273fcc3f27b4acb7dff1f9810f6f9414e8af67a1fb0a2a13eeb99fd92bb25
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate malformed exploit streams and link farms, suggesting the PDF is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=schaum%27s+outline+of+statistics+pdf PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/telukunene.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/73336574299.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/9126676224.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4382cf18---foxejetakikix.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/50982782876.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905164852191107.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jarexolemururotisebeje.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6f1e3093f082aac8be8cb38dc975292a/95654544409.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/janipejutatokebipi.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/pefemetan.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/zadodulob.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/43fc07beb63ed34a985e4849cf7af38b/85531781072.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/42788265132.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/66406918899.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/44434419197.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dl61i55i5a3mfismmvuio6rbsr/46005696279.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/fimodipidufuke.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/dajegovepikufi.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/65667081217.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/ziduboforimaposomo.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/levorotifidugizekigemi.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/dapopaxikazitepozad.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/10177093080.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/93291264191.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/52015262220.pdfIn PDF document text
    • 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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10992 bytes
SHA-256: 6edea8c061e525d6b75c56f254820b89f5077c605f772a768df4392a0ccfcf61
font_02_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 17592 bytes
SHA-256: 62ea70333911bca8ca342e81829488618adc0a8f181dbad1b44e7a188c48ffeb

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