Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5af2c368a7f3ca0…

MALICIOUS

PDF

91.0 KB Created: 2021-08-11 10:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b00cea974a075cf6972764ff3f84b191 SHA-1: 12fa56a1c0caa19f646d1ddb643a20aa19b1d2d8 SHA-256: e5af2c368a7f3ca095c9fadc4b4779244780b1c6de0d1c935f41906c2201ac79
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fbe9d949---nalazuzuxafaji.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af8a00726---ralikamogegazesevanugubo.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kafezamubiwitafelige.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac813871120---44863553552.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/85764495881.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210618041649_epogov.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/04c26fd3cd807cb04ada38aed70a6fdf/girixukok.pdfIn PDF document text
    • https://superpart.com/files/vubagelirobogowudabodu.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/vamabomowuzupurikunemawun.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/10377040808.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/6300021557.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/madujelifojudovu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/97709751017.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/lubimijozivovewifa.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gukadokugelefemefefe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8792823c---pofuk.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8f2a4d33dea385b24cbffb13975f0cca/desosejaf.pdfIn PDF document text
    • https://rinducm1.com/contents//files/60431991974.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/pumapujaduxaloxovalixi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/bifatetuwelu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c520db0856---79612035801.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/pupagekufe.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3qc78dme660uu611mdn6oen5ep/lugupawog.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa93e46a98---gerokogaporakodogakaxevo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d902bb9699d---98368173050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=taken+1+full+movie+in+hindi+free+download+hd+1080pPDF 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_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 16884 bytes
SHA-256: 10422720036b8b51b4508d4b731f58125bb7c76ea16fcf35006ffec096d4dbea
font_02_sfnt_off0001430d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430D 11188 bytes
SHA-256: 771da8cf94af4019ff274cf93f9584703ebb46c832504b3fecf99763cb33f8bc