Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccbf5eb34fe009c…

MALICIOUS

PDF

69.0 KB Created: 2021-05-30 10:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44964e6dd49c99678da6d52ce9112d02 SHA-1: 4f7dbba09a6558ac2e84a7b53fa0bd02ceb09e31 SHA-256: 6ccbf5eb34fe009cbfef0f74059828c434e80d4b8f2e88a643e3a69043930136
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF file contains multiple links to external websites, many of which are hosted on compromised WordPress installations or use IP address literals, indicating a phishing or credential harvesting attempt. The document body, though heavily obfuscated, suggests a lure related to 'museum exhibit proposal guidelines'. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e765368af168451ad179dac8ef869dab/muges.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9s4ksdo0uce6a8vannu66a7a9m/vinukaleru.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8454ca3e---gusalurel.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/cee6a08d503b6c2440c53388b176a3eb/wawilozexogodusemasotiw.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6aa934fa1acb827a5b5cd0e2e3c3fc08/xuneretel.pdf
    • https://fizjolech.pl/userfiles/file/79350729172.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4e838e9469c4d5fea5ad767414a8ef0/13928275298.pdf
    • http://trendymamy.pl/userfiles/file/50605045293.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a143c2e9a---kixujadinujusakade.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/peo0pmm7vurn5tnu90iv5g3fr0/68371234611.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83d4b2743---94567205394.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160775e9214a43---fubelu.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f0b81995eed382ace6c437cfb2f4a7cc/83623476285.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4lcapugdji8i2f4sgtdmribae1/lesidevuforipogibed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=museum+exhibit+proposal+guidelines
    • 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_off0000d08c.bin
bbe845ade8fb0c25ef922dff14e651fdfc629e1f9f6bd690b3a5e21c11f57933
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 5584 bytes
font_01_sfnt_off0000e364.bin
452456f0667dd78b1b81b53c7bba2ad268bace63277e0d7ae0a7817b54561d82
pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 10448 bytes