Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89242cbd24f58b9…

MALICIOUS

PDF

72.8 KB Created: 2021-07-19 19:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef3ded2c866ce14ef878a809621c7789 SHA-1: 54975f9b2ccf41d1383bd13ba831ec83ea9bbb93 SHA-256: c89242cbd24f58b90ce6b4619ae947bed421a8c37f43e140137b140d5bdf9008
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to PDF files hosted on various websites. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://tenshinorchids.com/FCKeditor_upload/file/kufaleboguraweva.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc9b43951---8807795925.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5348938b152559c7714ee556f9ad4505/69967477458.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/sno6l137h6103m5ufjtq63rmo5/genire.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/78229247956.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3b97a4fd---34048176433.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kedupugaxopude.pdfIn PDF document text
    • https://atl-50.com/files/file/22426876025.pdfIn PDF document text
    • http://ruihuitax.com/files/file/79915430771.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/pewajevew.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/28650233721.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/tidepexegibitegib.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b094458090c---81230881781.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ucd4le5f7mvbu6d2m4s0fh7q28/ponopikot.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/motobelofupupamamon.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/75855525184.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0417527fdf52705d12812b023f059bed/xidegex.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c743323e181---zogil.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4fairbau5b58rbn5a7m64i3gp6/79413055499.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pg8jpnfq7s195ldi2sdestnjsj/99286788090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=love+did+somebody+did+somebody+break+your+heartPDF 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 16408 bytes
SHA-256: f76f47c15b0fda21c37fffde0779f34989cd24078f8ee265f6e3c7ef2a0345f1
font_01_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 10832 bytes
SHA-256: b46f976aa780eca75cc6bcb2136462f8bf27cd67502e45f1c701a1c90636253c
font_02_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1