Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3fa55ac123ee37…

MALICIOUS

PDF

83.1 KB Created: 2021-06-24 03:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb54cd618320b6fa78775335d4f5e90 SHA-1: 8a6cf7fcdbb6d5b25d3438ac3d265ba111503dbb SHA-256: dd3fa55ac123ee370d44296a6a741cd87d0a01ea0cdedfa7050c1ddaa1ae1ba4
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/remug.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/00670f2a185ec5bd2d7b2765ce26a48a/72957570702.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/welagiwegij.pdf
    • https://juhaszautovill.hu/userfiles/file/bufakalusimakilonalefoxa.pdf
    • http://hndgyl.com/v15/Upload/file/202169125375911.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f600d4ab733a4669c49e3e304ab7921f/japevatutiwuzozejep.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b599220e177---49357585265.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ddddd9e54---sututoparazezanugigutov.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e09e1437b3---rowafiri.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/sefplps3fitm3p7ca1g0c50poq/luwubit.pdf
    • http://stardentalcare.org/userfiles/file/tixiwosikonelisat.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083687a666b4---65276292698.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1b09bf99ac5f96fbecd0076e6732b1ef/lozuminepefuniberemobije.pdf
    • http://artecgroupservices.com/imagenes/file/86136537216.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f1770def---24559780003.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=given+roots+find+quadratic+equation
    • 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_off00010512.bin
78c1dabd161e066db33f4c788b0409269bde64225bdd1290255c51413c8beda0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 5200 bytes
font_01_sfnt_off000116da.bin
182803f55857cc44937b03d8d9aa850f41e7625edd054120206f6d8db6a1e6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 12236 bytes

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