Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd367ed94ae18b48…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 16:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3a97c965ffaf33871ce870e6fb60786 SHA-1: ee5d3241c13c40d82ff783b6ceb89eb25ee4dbf6 SHA-256: cd367ed94ae18b481678ee271157a556f2a0b2d859391758058a1e4facf818ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a high number of embedded links pointing to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself suggests an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=elmo+coloring+pages+pdf
    • http://oaklandscreche.ie/userfiles/files/furabelakewilizez.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/14a83d78012e1b6167bd0e003b6a002b/vuwowebuvogefopivegarilip.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/76547214247.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f69ddea9---vemasurowivemu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777a0c36791---91244159512.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/idana74ooeu6re79v9ll1smb61/65204660306.pdf
    • https://alakharia.com/public_html/userfiles/file/93016590625.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae1396e676---54568174185.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7f3b108a0cdb16529eb8e66d97aea109/numedudinawarumimo.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/fozebibewigamakejum.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/172e7d1db366399c4d2d2f31b50dd8f5/94167047327.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72d1c173e---wajaligasinepajox.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946929926bc---84795225996.pdf
    • https://nenanhduong.vn/Upload/files/88726512060.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f1baafb3eed372999de9e14f55feb2bf/28225902584.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/176c336b46acbb04f5f767a28ebdd0db/radavetisawome.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/585f329f5358490b510d5f395c982722/65733943331.pdf
    • 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_off0000dd3e.bin
5ee78f0e6af0a5148ae33ccd5b12c3cfe222a28c99863cf4a12d0e8b324286aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 10848 bytes
font_01_sfnt_off0000f5fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 16792 bytes
font_02_sfnt_off00010e0f.bin
632cfb0c3e546e4b62244d683ed5e40cd7ed6713b02f93938986cf67c52bd987
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 16864 bytes