Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c0326d7c7816dd…

MALICIOUS

PDF

115.4 KB Created: 2021-06-27 23:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b32c1a7d1334a1ab1df97730304e797d SHA-1: a68e1024c5d949e84b195166d4cf03ef216b1cb1 SHA-256: 15c0326d7c7816ddce52f2a5eabbd413336453c98ade62728919236fa6b682c3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a redirection mechanism to further malicious sites or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=louis+tomlinson+at+niall+horan+concert
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee82cebf0---fizosawujidi.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607413248b706---dukoliw.pdf
    • http://menafundinfo.com/userfiles/file/pemalujisakefodumatisoku.pdf
    • http://waterreducer.cn/d/files/suwoxuwenenogenepe.pdf
    • http://fujavietnam.com/images/Download/vavopofepugebuzaj.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105271034218508.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349ac646bb---beduguximoxusopesex.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029f322f0e---7770009764.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed558eda4---vurenaxaniw.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494fa45a98---44209015723.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4378b88badf8fe6d01c43c7b26ce12bc/nobuvidenotesigexi.pdf
    • https://soechi.id/userfiles/file/luzepomivapodaxubakaje.pdf
    • https://bakwanudang.com/contents//files/71108084742.pdf
    • http://bonsaichik.ru/images_uploads/files/13573623121.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d67e68969c---maxulekosuzo.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/adec672bf8e9c2a1a34f9638db24c936/webejuvot.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd7594bc0---43751583352.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/47a6c0453604fef350a049ca9440bd79/81583562001.pdf
    • https://mmszke.hu/files/file/satetabivetamudifebidezu.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/c6rh1v1cvravfl4f76ngmle3aa/18611655243.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607847711ab2a---9663782226.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0b06eaa97c6dc1a720569d38969c9bb6/16643833306.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/llkl2elkblkjinn41vo5vfvhl4/37024411731.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/41762eb5c7519acee2e5a03120aacf77/kinojaludawavalute.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_off00015d1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1E 16792 bytes
font_01_sfnt_off00017535.bin
b11d4b159c8ed7eff20f5cbad080a43afc4f75a6329d2b15a3116688b260251a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17535 10552 bytes
font_02_sfnt_off00018d12.bin
fb6adde0d704fc50e18b866fe3a4a1060c9cf31076a1226dcf7234f70441e41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D12 19212 bytes

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