Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69dfa6728a1abb4…

MALICIOUS

PDF

65.5 KB Created: 2021-06-22 12:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357798ff035f6ba694a6a3d4233bce82 SHA-1: a4fd5c2b2254f37385fd2db38d1a17b30cb2c954 SHA-256: a69dfa6728a1abb40d5a0499873c0dcc23bdb5819c2e7e94210378ecebb365e4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised websites, suggesting an attempt to host and distribute malicious content. The document body, though heavily obfuscated, implies a lure related to 'pdf combine free download', aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8b23c51fc10e058f353321a2b43b01d7/fakokabobepabuxep.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecebc7214849b457b72c44252864110e/nugufovetapusoxirabudaj.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083297e72000---93198797091.pdf
    • http://sl-light.ru/design/img/upload/file/86087360744.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e372916411a27eeb93461bd2261540ad/20470948898.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/fa737ea5baedd250018ba57f7a04d90e/burakizixumejizoluduriz.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c100fd8e46042c16fe7771bf8ca8a167/78802125371.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988e2f7fab8---givulotuwiropofigenexolog.pdf
    • http://saltokisport.com/uploads/files/84219524456.pdf
    • https://sieuviet.net/webroot/img/files/35770955456.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a185877a---29419685928.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf195db6b7b---51261607273.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf842112ac7---67488610998.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160739282e6a5f---34919852569.pdf
    • http://www.aqsclimited.com/EditorImages/file/68660967195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pdf+combine+free+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c362.bin
ab5d9729f7566ceaa84d4fd04b43ce024e8e7669d25804cbb55dcbed75fb5caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 5220 bytes
font_01_sfnt_off0000d51c.bin
d3453e1300ba3d534c6c0747d430289c446dd6c2d62f9819e6585e961b8c8818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 10520 bytes

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