Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fc7a02ef172214…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 01:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e867d39237f3e5cb1625fe70e60fa75 SHA-1: 686d2af22a673b9388abc9b51c69ab5fcab12d68 SHA-256: 43fc7a02ef17221480e5c83f7d398a195e3dc63ff6a3796b2446dca0cbe0588f
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/94604279089.pdf In PDF document text
    • http://varosom.hu/userfiles/files/36721971720.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/wetaridujakomatisafugi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1902a400d---82187023092.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/wotojunovipufavuxiwosil.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zojafaroramerimaminaxu.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/93700252669.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/69051298675.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/fufokik.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c707a4c10446fd8c3bbd85956c2cd2a4/38878671169.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/voboxeforifemufepulas.pdfIn PDF document text
    • http://schturman.ru/files/files/53320931002.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/64393634288.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/delakiwovupogeturofis.pdfIn PDF document text
    • http://synphabase.ch/upload/file/91544200073.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/91694839038.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mowamu.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88828768528.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wabegam.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210908172754.pdfIn PDF document text
    • http://safetruck.gr/images/file/56015910139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=earn+to+die+2+hack+iosPDF 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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 10616 bytes
SHA-256: bc4f0b4b9fc671235467daf5d767ad906901f453e7138c3fd3385ce0b679d689
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 17344 bytes
SHA-256: 27071aef202cf986e253191650a6abe5e6bfdc54917bff4672c753f29be7e9ef
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1