Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63d42c1a272d7ae…

MALICIOUS

PDF

179.8 KB Created: 2021-06-26 16:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc0fe04c446be599a2eac1f10101e35 SHA-1: d562f1cbf57cd50ee996da9291106d9b33dc30bb SHA-256: c63d42c1a272d7ae8c7130062202917fd668c87735b9d6109e4838f295b6b35f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=complex+numbers+solutions+class+11
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f69e087b7f6b2370bcffd353b40a6cad/88466377384.pdf
    • http://vyveva.eu/UserFiles/File/mefesafinaxatadigirimixu.pdf
    • http://aimic.com/userfiles/file/muvemovezatolalopuze.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2etis1vjqm85i96r2jhdib7ji6/21246744601.pdf
    • https://alternativecarrepair.com/userfiles/file/ropejuxirabagipopinalulef.pdf
    • https://zabulgaria.org/userfiles/file/29351320371.pdf
    • https://thefencedocumentary.com/adminfiles/file/2413110913.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1l08btuekic7r06oed4pinsl32/62839926613.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f079940fbd---pabid.pdf
    • http://euroinstytut.pl/galeria/file/bomupiga.pdf
    • https://cafe-malaysia.com/contents/file/buxewewigurikefirasisanet.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977adc7e09a---14243155985.pdf
    • https://almuhja.net/ckfinder/userfiles/files/97898352967.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/mugesuko.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05dbb1351f---zosudex.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe96fc261c---33212399143.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/89a7f9ffe3bec155d3b6896b5ecc5712/nanekemoxipe.pdf
    • https://hpsoft.shop/upload/files/92632429702.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad964adec---22708468618.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f813e899---fixebirogegujob.pdf
    • https://bititechnika.com/uploads/file/77894071123.pdf
    • http://esistore.be/userfiles/file/37818411014.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ts3pbfjp3n6m6mqsfakri6rk79/vaviwulejejijapazonajiriv.pdf
    • http://jpmoto.biz/upload_picture/22407381347.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025c55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25C55 16792 bytes
font_01_sfnt_off0002746c.bin
1774e3853c88f1744fe2e26cfe6ed1292bdf2d91d3e9e8100f5c6c316ab52451
pdf-font-stream PDF embedded font (sfnt) at offset 0x2746C 10960 bytes
font_02_sfnt_off00028da9.bin
69b2ed7291da91173df33f25d28462d01948ede6efb354ecaa95d9f6adc72a08
pdf-font-stream PDF embedded font (sfnt) at offset 0x28DA9 19092 bytes