Malicious PDF — malware analysis report

Static analysis result for SHA-256 157e3489e9a4b562…

MALICIOUS

PDF

92.9 KB Created: 2021-08-17 10:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 206929c47f31885f021e547a8db685a7 SHA-1: c47b010e96e073ea9645849709281f2bb770098e SHA-256: 157e3489e9a4b56201fbe25f86c56232061b8c0b0e4842b276b733ae49ebb0f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3931e936ceffda2d3313513821a8f2e4/67324069878.pdf In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7f8a6990fc0eba3346778d5e5474d28b/kuzozis.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/19489053013.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/58041894436.pdfIn PDF document text
    • http://kco.su/userfiles/file/miratapeburazopinularuz.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i2qidq7f6l6cdq2h9vhmdqfa0p/dogulububetokigejawodov.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/68168664056.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/85991174439.pdfIn PDF document text
    • http://agama-rc.com/upload/files/xirejozawafokazat.pdfIn PDF document text
    • https://pichsas.com/file/gedimuwejipedamazod.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/50566084386.pdfIn PDF document text
    • http://keramann.ru/uploads/files/setizoda.pdfIn PDF document text
    • http://firegallery.ru/img/upload/94276779159.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b01c8751eadf7cff36e810a26ac6bb43/kogojemekowuxukoker.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/6866899553.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161043d7e4dd53---resob.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/79075651898.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rogonuvipitis.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed177d537---lufademukok.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fubumaga.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107271100154390.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/resovusetoloziguxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=efootball+pes+2020+reviewPDF 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_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 18240 bytes
SHA-256: 9d82e11572fb2beabc285d2990f2ca477e70324cddb220bf2bfec3bd148e7037
font_01_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 10764 bytes
SHA-256: f79dfa653029d3f2058b4b0455f5e36972eb1ee5fb25166db1b0861f38ee3026

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