Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3749945a93bd313…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 00:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2273739e58945bca7910cf19a92044e1 SHA-1: d966cde5b41c822344017f31af25572cf217d007 SHA-256: b3749945a93bd3139fe4f596fc3286fc4bd2188dfa41b63f53ecd81804f8dc4b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing SEO tactics, suggesting a phishing or malware distribution scheme. The presence of a link farm on compromised CMS upload storage further supports this, as it likely serves as a distribution point for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://purevdavaa.mn/uploads/ckfinder/files/52853803216.pdf
    • http://zaiger.ru/img/file/jipev.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/16661749436.pdf
    • https://leosservices.com/userfiles/file/kerelasim.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bdc9e4a29---pavilozagurezanopi.pdf
    • http://tuanlongland.com/upload/files/zesobofatamegafomibixufi.pdf
    • http://floral-design-lindgens.de/userfiles/file/gomuxujapaguk.pdf
    • https://granitabrasive.ro/editor_up/wewoj.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8c9d968d3969254494e6d115f05a28df/vopusu.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/26acd84f4422bda77b9c549f93cd9769/povepaxib.pdf
    • http://dubilex.com/userfiles/files/39195449700.pdf
    • https://5a.ro/ckfinder/userfiles/files/zafana.pdf
    • https://adamslakeband.org/userfiles/file/suzutelipixuzalom.pdf
    • http://zvaracskaskola.eu/editor_uploads/system/files/rukanemo.pdf
    • http://v-lukomorie.com/uploader/files/gizopekeni.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8ca53032---99323697010.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9d0bdf948a005c78e81278b637d416f8/jonulazasafelowo.pdf
    • http://alacarte-grafik.de/userfiles/file/daginikavalepafiwepoz.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/20887833706.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/xivabavelexegofozixore.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/gnpjbvk5bad5jb7fvorhrhth5h/jirusefafosojikuxazo.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d80a889b07c79bdf97172d80574496f4/jijamugagufav.pdf
    • https://fsreloading.com/userfiles/files/48031274977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+apk+app+for+pc
    • 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_off0000b057.bin
2c64bc3c697ee9b625dfa6b882a7ad5e97e3f528a77f07380ef071bedb006288
pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 10304 bytes
font_01_sfnt_off0000c7af.bin
4bd3457b33a2a420ef4386d0630aa8342370614a4a519718b72b0a0e6ca5f0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AF 17860 bytes
font_02_sfnt_off0000f4d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 16792 bytes