Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c0a28f92ce78b…

MALICIOUS

PDF

87.4 KB Created: 2021-07-25 18:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ddc784ad1602c153f9c0d71fcb8e8047 SHA-1: 8f8217fb1baf755b2025843d60c4a44542d7cdf0 SHA-256: bd5c0a28f92ce78b5340e6e5f287c20d0364b45741e6b6b364c39a665a07df26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afd22148e---lovatanu.pdf In PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d1f1aed438e5ff44e69b256c5e28fc74/72226878104.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xetokusopisupikuvit.pdfIn PDF document text
    • https://primer-spb.ru/files/files/zaxomonazo.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/75220048994.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4874cd981---tigapare.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6abbd02725---42132862833.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/18312714668.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/dinibapipusipu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee82cc400b9---23572993341.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/61400513819.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dc386c63---sesarokad.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/11480573613.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/237699f1f4fbdfab56b1e4eb170ff8da/65317113769.pdfIn PDF document text
    • http://mldinsaat.com/image/files/jifadonekabo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/43586772142.pdfIn PDF document text
    • https://bnovum.hu/downloads/wexugetifater.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ad7887a06b4d816e507bd0d48f5b65ac/selataponeful.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/80d640068091131dcc44d238ccba0846/dafibavofana.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106011030206538.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/20815478583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+an+essay+on+teenage+pregnancyPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16408 bytes
SHA-256: 9c761924906532914b83bd4561e5166cfa5c2bea29488e7ca014511d8c3ea052
font_01_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 10696 bytes
SHA-256: 2a050e5b2526f0e44cc4f1adbd18774d6969e66fc7611fb1e8af98d79edf4827

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