Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ecb4928431a835…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 10:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dae6b2bff843dc8085c590391c27296 SHA-1: 42be5dd6efe50111ebcd4c863e97723959539e0e SHA-256: b5ecb4928431a835bffa679dcf7d2090947ca8effd733a0d04e92ef1b3d62beb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://saptabangunmanunggal.com/indomobils/upload/file/70235818705.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ok12r28d4l9kg2s8k1hpkd2b8p/lusafeduwatusudinokimif.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9576b163d---kexurefexis.pdf
    • http://chineseclothingonline.net/File/tenulav.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/zetetufave.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/segizale.pdf
    • http://a1climbing.com/userfiles/files/89011726303.pdf
    • https://batdongsandothanh.vn/luutru/files/94673999511.pdf
    • https://kristaldicarlo.com/userfiles/file/bafunorisazufoxef.pdf
    • http://www.pzkexie.com/up_files/file/76698940330.pdf
    • http://usaoxin.com/userfiles/2021-9/file/27159018604.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9d164f50---jubozob.pdf
    • http://gazdalkodjokosan.hu/img/userfiles/file/19186042213.pdf
    • http://rfychina.com/upfiles/files/16325490028581.pdf
    • https://condicionamentofisico.com/arquivos/file/66446253545.pdf
    • http://escuelasfutbol8.com/docs/files/pewigamegotofogeteduka.pdf
    • http://marketypik.pl/zdjecia/fck/file/20824685758.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472046b8bda---migirulujat.pdf
    • http://syntrend.critical.tw/upload/files/66457812057.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/xamadupimemorub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=class+8+science+book
    • 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_off0000ac9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9C 16792 bytes
font_01_sfnt_off0000c4b3.bin
841e4c858c4c09071b6089988b9ca896b0b40768e5730e9cc2376c66adcf9859		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 10496 bytes
font_02_sfnt_off0000dcaf.bin
0fcb55173ccb75646c28aab2dd8c67936f680583d6e05f05f840ddd2781984be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 15708 bytes

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