Malicious PDF — malware analysis report

Static analysis result for SHA-256 42359de59caf905b…

MALICIOUS

PDF

90.6 KB Created: 2021-06-18 15:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f26932d675d242eefc1ed21b1df88c43 SHA-1: 5ba52cbdc390f66f0a58544101ee0dd2257b1225 SHA-256: 42359de59caf905bf2c5e0df06bf878754c9ff931a2c8be7cea8622ed4102faf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, likely serving as a distribution point for malware. The document also contains instructions to disable security software, a common tactic to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab94bc0e67---53370835862.pdf In PDF document text
    • http://altinay-law.com/images/file/27202933616.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c337c3d1bf1---22541534334.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b976830b00322440f498689834f03dec/megesefoxisozurenux.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/902fc12fb2935e970176fc2679675bfd/davofusokola.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/9246a412f838cf74f3a18e785972697f/27201594126.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jnnfju5sv2nr0ishta5ahhs5rs/85371823578.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5238636ae---tararamavasetekixinuxu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7256322414366ddcdbe10bc5e533f1f6/34856205258.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961f600185b---6656987212.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/36399961580.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328fb86acb---velipekomuxizazagipawebit.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30129238270.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/933ab409a5b33fb696fc61b0a710a488/94787878635.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8acaf8fc5c---48372259511.pdfIn PDF document text
    • http://4bx.pl/public/file/33826366679.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=autocad+free+download+full+version+crack+2016PDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010fbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FBE 13804 bytes
SHA-256: 3af826cc15274be990dce8c4352209ab052199b675703f588e81730ce7e50bb5
font_00_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 5700 bytes
SHA-256: 066380f72673818a6f3bf338d3dae85e5518fecefdcbafd886939c5f17f287e7
font_02_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 11216 bytes
SHA-256: 161314afcb5c35f39f597ce64e9c5e9aabde32fcaaed4ff4eed294185ce26eca

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