Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d41f622ffb8d807…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 01:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cb0dcbaab7e66f74cead0f6abbbfdf1 SHA-1: 51d6b5514044105a560dd265d0e4f89d5f33f99e SHA-256: 5d41f622ffb8d807b052d1bb75c51ba4679bbde8924f2104a484efccceeb6df8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a9ec19a84fd0f8d57995daad0d5b8268/gadajudibujukum.pdf
    • https://webornate.com/viking1/uploads/files/14105225673.pdf
    • http://canadanur.com/resimler/files/33325056782.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/40184146534.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/tddsj2h5olsvsglq6mu3s9ccpd/dogaxukakanasazetuj.pdf
    • http://x04ydivan.ru/userfiles/file/dirujowajugilirapope.pdf
    • http://www.centralperdana.com/file/13100666280.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/2703079648.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/gasagolitogogorafatitup.pdf
    • http://doo-san.com/userfiles/file/20210606065757.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/eae8a01fcea35ced7be9ac3d2f382377/tagodav.pdf
    • http://interwork.sk/userfiles/file/54517581651.pdf
    • https://meganimal.pt/site/upload/file/60279042609.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9c18bf0fc4489408281927f7f1a61343/wekogiwapafefifisineluw.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaade2d9191---tevogunewalel.pdf
    • http://okuninka-biale.pl/userfiles/file/piselepowunoz.pdf
    • http://benhvienlaptop.biz/userfiles/file/59145655953.pdf
    • http://stevis.cz/files/file/74882265578.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7190fe40f3---41186364706.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f9320911b8a1bc09e2dda05dbfb845fa/niminagobe.pdf
    • http://provia-events.de/pics/fotos/1/file/10087278153.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4db381b86---feberovaloz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+feature+writing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc15.bin
9f47cfd38846a5734450a6a4a80e0fac393a41518d0169bfb833594ea18fb30c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 10356 bytes
font_01_sfnt_off000113a7.bin
1378411558742ad0f532e8a3260397a7de470a50145eb69d8058a1bdd63b0059
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 16900 bytes
font_02_sfnt_off00013fae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAE 16792 bytes