Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0551c86543a2828…

MALICIOUS

PDF

75.4 KB Created: 2021-05-07 23:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4d8831788aa3640e0a3468ba8c7eba3f SHA-1: 9ad76e83fe7097a0f2add3fb0f5288ef116c4aef SHA-256: f0551c86543a2828c490ac736dedfd7b7076b0860441454384f2abfe6e38ec59
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded URLs indicate it is designed to redirect users to potentially harmful content hosted on these compromised domains.

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://crysiq.ru/uplcv?utm_term=design+engineering+canvas+sheet+gtu+7th+sem PDF link annotation
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160867f03ea026---97731770593.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4ba41cffa7de86386603b17cc2f2582e/polikasebatusiluxolebo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/medowajoniba.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0f3ef44e9a5508ddb2da8deb4122665a/rukadaduvofirekikarok.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee73c154f---50300076776.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/624b91c9b95103e3efe96900dffcad9d/lujilun.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a324df2---21561011197.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/95fd2e101379d6370b717b7086300b64/ketejifofonim.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/69073504403.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788ec88f6f6---91713690532.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160719fca42359---28570626229.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466053f2e8---gepifojiso.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c2f063a7a19e7ab81489e8e497978478/fanezuxarebizopedidosi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t550h057lp6ubfmkij6es660mv/sorepebep.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d930598810---bakulakomidomozozifedo.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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 5320 bytes
SHA-256: 49fab661f7f1b45bc1d521f118c8589a4119409ccf39694790b918b0849e7625
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 9892 bytes
SHA-256: 913d1df49302cd79bae6b7efb3b4f06d952fed82b28b140039a7e81d64273cbe