Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c9bdd2571c0289…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 07:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d13ffcefaf6364d8060874cba48171a SHA-1: 54051cde21a69a9b4e1e3dc863040d51a870e5a6 SHA-256: 29c9bdd2571c0289ed8e033740db4d7bfc4be6b5cf9b617d5692c853ff47ed55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://keacg.com/upload/files/15072819259.pdf In PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/40300845071.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lokumetulujafogonire.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/82426441064.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9d9bb5ec---46501536933.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/81590937878.pdfIn PDF document text
    • https://badoza.net/userfiles/file/51141649398.pdfIn PDF document text
    • http://mp-journal.com/media/file/81063129196.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/75283050018.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/felilunev.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/47295965463.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/57303883249.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/54074666748.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e211127d8---24292710420.pdfIn PDF document text
    • https://epiphanych.com/images/file/90877709124.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/34613910412.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a433943e8a0---5188617740.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5872c1dff48a66ed2c1c78860db67ca5/49579126819.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a899dfc8bcf---2618126966.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e030fe1596da4246f5ebb7fc65c0225d/56735528589.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c533a684914---temusitajenupugitizujemit.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/walobobubonekupada.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/57590086288.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nagod.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ilnfdae78kqs48227v8b7b2ok0/71900708390.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31660698c2---wewelififumenewiginix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sultan+full+movie+tamil+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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c
font_01_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 10576 bytes
SHA-256: a884fdccb9c0102102f53721544b80be9fa0325c614bbff744de8be21c121a03