Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb7298b517db24b…

MALICIOUS

PDF

83.1 KB Created: 2021-06-30 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ed93dfe7b1a702665bb77f5b3baef90 SHA-1: 7324d1a31a948ea94378a020165c8f86ecb636e5 SHA-256: 8fb7298b517db24b83e2f0dc38ebb314797e3aa715196e42b862de98985c69d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086a1ca3e943---wikivipel.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/570679c7b38586f9da9316d8fe562483/78276342569.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea2ceaec2---34201852574.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8c785c4af345ba239cd61662a216a881/81333957520.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/15a0a376c792cbc369d17f8d1dc8a7ce/jobanamuwojirosodixuvuku.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7de6858040fb8b17dcbf33ddd98c8d36/bedekutegu.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/44456306605.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a314bde9e00e1187b67d6f4bfbd01230/sikigunivipemupotav.pdf
    • http://kjphotocon.org/data/userfiles/files/sunanobasedomurored.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72a114ce8---kunewotigesap.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a557131fea661dd537f3b99c3d8aca6a/limixun.pdf
    • http://megalaserasia.com/upload///26517617795.pdf
    • https://pharma-tools.eu/galeria/file/76406726944.pdf
    • https://promise-land.com/upload/file/buxodapuxe.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/727229cac98f5a5ecddc820b6386646a/pitigupefetigobaz.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b37d6d5e---lixagizoda.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/dibugeparosobupoketirowam.pdf
    • https://bevelec.com/bevelec/dossierMois/file/tewubexemutiniwuwo.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vakqbsmnvkhhr6atrfc4mbo7lg/vaxoxepiwumedixanusa.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b7247524fc296bd483e3a425b0fdd370/39528916822.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6b7eea0d19125427e45ae2387c2666e1/7427446968.pdf
    • http://thebankcardservices.com/uploads/files/xewuwowozozinedikamo.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c62479e2---wugavego.pdf
    • http://zaun-produzent.de/userfiles/file/bojenexorifox.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ffe560f5---zujuvajozaxotipunifimuvun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=blaise+and+pansy+from+harry+potter
    • 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_off0000e0ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
font_01_sfnt_off0000f8dc.bin
c03b66931cce67c682e6405b1f5ed5419fcb03a8f24c3d7577aaa33c52f78338
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 17156 bytes
font_02_sfnt_off000125a9.bin
37ebffdbdbcadcda533f9eb231491113c37d09c820081a45a39130440fde43f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 10932 bytes