Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ddafcefb3f5486…

MALICIOUS

PDF

91.5 KB Created: 2021-08-22 08:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f129fca3c7fb066258eea7f0d339910 SHA-1: 65494d5c0c2fbc1dfcf47e5e36941a91198c6b40 SHA-256: 52ddafcefb3f5486e296ec00028511ca30134609680319e6e38c73f68bf2b55b
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is identified as a link farm, likely intended to direct users to phishing sites or other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the sample being flagged as a phishing trojan. The presence of multiple links on compromised CMS upload storage and disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/uplcv?utm_term=investment+agreement+sample+investment+contract+template PDF link annotation
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/381fec8f2eb42696a3726fd5b733ddc0/92290629828.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/da6abb90c26147a0c82e996a5ec12e7b/42875649123.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/fefofa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0a65c575---5836881225.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/32800079277.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a4401edcedbd82884e3139dcfd8b3e32/79386699023.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e562c128ccffae9a1f0008f9716e9810/mademuviko.pdfIn PDF document text
    • http://yanartextil.com/firma/files/67225116107.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/06046b54ea2f41606f8ddd278d342420/juxalokubebumewaxufesox.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d1d18d1---jekoxulebenujo.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/2067621103.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/6476380882.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1da5e334f---41552716975.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607574a7e0345---33513399590.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/galorenepowumixiretigenur.pdfIn PDF document text
    • http://gyobel.itpublic/file/35128030288.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/64840cf4d39f3bd6407632ec7fefc524/pozofaragirumow.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569dc7fea2---jobiwobidukijumaxovibi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf6e52ef6---minomujagirikajosexi.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/60644675110.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/luwutuvokapagovaji.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/42339757749.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/08ccffdcd6902783e2b9c0135e3fafc3/10094802299.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/guwotosajaxunigevig.pdfIn 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://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_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16592 bytes
SHA-256: 60d4cd1f6ae8d13212e1222eeb500b75f32b838c8d371ca8e9c6dbe78c66fafe
font_01_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EC 10732 bytes
SHA-256: d2c2a22914910c689d894496891cf4767cad0a1f1a3ced1ba3ea92800ce25a64