Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1d8144519d0a55…

MALICIOUS

PDF

97.5 KB Created: 2021-07-06 20:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be9e868ed18affbe0d4360ab50fb17f SHA-1: d8faee5a3fbbd56c788be7deb6136f42dad8001a SHA-256: 5c1d8144519d0a55919cbfd4e60ebda1bcf012374a9fa70ce1fea07c4410f14c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gtshotel.it/images/file/zomogozagoxafonerirep.pdf
    • https://tskrea.com/userfiles/file/20609521815.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/99270770104.pdf
    • http://beiks.info/public/file/15788441252.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789fca89db3---wefexusozebasuded.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iic1jo0rmb5a1dffnr8dssogn3/96620097367.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/85534621884.pdf
    • http://jhdjt.com/images/upload/File/78465082268.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608167f82019c---52033256089.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fee9f15d7fe9fd4c7f07935f2c310a17/zumiti.pdf
    • http://dh-life.com/ckfinder/userfiles/files/visemobovuro.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3mvsiubn6nfckj3bef3f6eac52/diratujumon.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7qkf0jgj2s4dvsel8d90bhev4/50635349710.pdf
    • http://sushikyototogo.com/uploads/files/82018908801.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/3774055256.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c040ef2241632ea3f6fcf6338277a32c/refivuxamajegifomix.pdf
    • http://shophouse.info/images/files/67157711821.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/kewixuvotavekotiwukupodiw.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dtbsnlnbd5k12aqsldfi5a8hh6/30888563359.pdf
    • http://jr-bang.com/uploadfiles/20210702202739.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d421576e---ruvuzobar.pdf
    • https://kisikana.hr/userfiles/file/nipoxerejam.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/47985c5e0bf93a913dc3a5ee8006aada/genufotunonerudebelunum.pdf
    • http://adamlegal.com/userfiles/file/bowotubimatefidi.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa652dd96---90548439034.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e2a2e051---tetulazebedumedanaxedibi.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76f237a3812b15c2babea6ee09fdbb71/nofiwal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=where+did+cotton+eye+joe+come+from
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010338.bin
2c371d2b2204aaa2901a4a34f9d3c81bd84b001c5e3a9c0f112ec2dbd39096df
pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 17920 bytes
font_01_sfnt_off00013159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16792 bytes
font_02_sfnt_off0001496a.bin
d0efbf5423116de0f68c7e0cfea9d736d276139d4301749e393c96a521932b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1496A 16628 bytes
font_03_sfnt_off00015fe5.bin
3b683f460788fb84f2a5e68787ed828a5a50c95563394c93fc4f9b52d8cce379
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE5 10604 bytes