Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3bda9199c3f8a6…

MALICIOUS

PDF

73.7 KB Created: 2021-06-14 06:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1c039d7f7860fb527f567c4c5e8fa26d SHA-1: d97dd68d9ec563a9ebcb20c4c8e381ee533aba6c SHA-256: 7a3bda9199c3f8a66ccf71ca631786868e636739173648923a6764dfd2c9ef93
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a phishing or malware distribution attempt. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=gta+sa+lite+obb+apk PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/61b3f1a12d90b6b5c3977dedaa1017a3/ligimogewageta.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a086a451c2c---pogubapovafivevajo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1d1chq6cs379g0q3kcam10c2po/nasapadojonomajib.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tubuziwifiboxonowozimu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c28565b1b03---novumunukifixizejusibiw.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5fq5hnkslbnogb6c8lvfrvvlof/83890882585.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2665071d2a---sixuwumijazininodotiz.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026cf43508---74712072713.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/37a268d7d3ad4f5bfa3886d0ee3c7f1e/3074584702.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/93718671040.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/nagujalu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429232843400920.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f5db68c1---rosewotamov.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/158976659fafe58d6d603bb87710c92e/buzefawedubenukerimesigo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad15e65bb---wedixuko.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57ee9a3e---bifedufazeduzebamo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a8a4ae5aaee8b9471f6b56054cebc670/zerapijaxiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 4952 bytes
SHA-256: dc6e73f1cbafea398137312228250eeff5378b49fdf7f343e61f54804be62056
font_01_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 10456 bytes
SHA-256: 4462cd8ab0e9137db6db33da679c0f5364063909ab22f9f53177fa222b74e88d

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