Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc59cfc18bd334…

MALICIOUS

PDF

94.2 KB Created: 2021-07-09 05:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 321573fd8bb07a3e69dbc4dcd56ea0b1 SHA-1: 66024068a6d558a105f8350fca039d1e54d704d8 SHA-256: 8cfc59cfc18bd334c2d312dc486764fb04e8039414ba536d971972fea706bb13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://omgmediatank.com/userfiles/files/12183970145.pdf In PDF document text
    • http://metafelix.it/userfiles/files/lenozivututoni.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sqq3deiofc84cp09veus562nat/52791374717.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50927295518.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/57660793408.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/46f4811a04288a2bcad019d425eaca0a/tevudaridurorojutezezupof.pdfIn PDF document text
    • http://cke.hk/userfiles/21081376531.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/wunuzurunimiroraj.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///dinapelekofigotolag.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24f555873---55011081992.pdfIn PDF document text
    • http://tfforming.ru/d/files/pewoxadidom.pdfIn PDF document text
    • http://mextro.de/upload/files/72023550236.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f9ce7e7e---3868561747.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/vizijivumixun.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1dd68a44caf248491dc52cb7d5798c2a/27592715366.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0g46oiu1lc3hbqafil6sesjil6/zotekinosujuloti.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a657dc367de---8017014181.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/25376059694.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r917f6dbk8424q0fpnkju8r6oe/55891171117.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/mujanaxedabifubimuvixona.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d644aa57b7c6c1404368f891136972c4/fulopedobukubi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a755b5be3d---82531005795.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/jofedanomigerinevategin.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tdtf326sg4u5n18kdcbeue386m/xukagoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=traditional+beads+designPDF 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_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 10524 bytes
SHA-256: ee6b3f87a75066dda36cb876fcb5dbeced9f8ab213f98cc8cce5c527312190d0
font_02_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 17152 bytes
SHA-256: 9b16c1bdcd836016bdeaf50f1f0609ad0139a4c13fff1fac9234f552d64660da