Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdfa433a01d0042…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 02:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9df74d21f401a75cee553c97854be85 SHA-1: 5742e2e28580e6b5233d4275ce00fe0bd551b9cb SHA-256: 2cdfa433a01d004251a79b10c58ce8627a0b7e320578b477a745f960abdfc87b
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fli.edu.mn/ckfinder/userfiles/files/lukabemoxuzeli.pdf In PDF document text
    • http://bndweb.nl/upload/files/zajidagovinerilisi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dd41da9a086046c2c88bb032783a63fe/50939405045.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/95903681178.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/pujiriwipoxob.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/zibutal.pdfIn PDF document text
    • http://webs123.com/userfiles/file/79058199017.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/23976081172.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/jonoxas.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/dobef.pdfIn PDF document text
    • https://iword.de/userfiles/file/fokijovafuvagilazajopim.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/tugefoli.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wepebi.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/66490252416.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/28421017195.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614427e08df73---7182012325.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/77824236277.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210919014542_y2ctoh.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/91066787850.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cf140c539ac5a0f66703cada5ca83eee/binodufusabebon.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/57604399243.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/6823537482.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3c07333d7c6c9013c5f2cb029b7838bb/fokifigadigavadurewadimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zapya+connect+to+pcPDF 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_off0000bce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE0 16196 bytes
SHA-256: 2b8fe1539d6e4748502a1701c8e6cda08a9c172dca2802df2e6f3d537de6d89a
font_01_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 10036 bytes
SHA-256: c91ab95d9a61a1a30010e4c0d7da4b9e6962bb61307ef878f743b29944d2c0d2
font_02_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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