Malicious PDF — malware analysis report

Static analysis result for SHA-256 127593798e322208…

MALICIOUS

PDF

115.2 KB Created: 2021-05-07 02:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 98c05010404ca1206454b8cfdd78ea05 SHA-1: e4c996458d873675e97de5add0eb67eea7103a1d SHA-256: 127593798e3222080786aa29c67a8048bbef9bb9e9721cabd2e4dcb4342ed82d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The document body, though heavily obfuscated, contains references to 'real flight simulator apk uptodown', suggesting a lure for potentially unwanted software or phishing. The presence of numerous links to external PDFs hosted on various domains indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7398

Heuristics 5

  • 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
  • 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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a93ef3e632b617911e49d586ff77f133/wilinidadabawofurulekuwam.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d4386d48---gupapareramomajewovejo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/81767815707.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/mobojivowavovifipox.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864c956584c---bozakugenakedetogarori.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/iv5hf0vif9bn7v2f1gl6gkm9sd/73075609796.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e59e251d---rugunux.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/28684777f388a77c86e28d1fb6cc83c0/7915529632.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814df3744b7---mesujagedopa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4hdnvbdi90n8lqcrgti89kpmf9/36330847943.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476413f5e4---22668727995.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608167fb37487---ziteposafusewivojafol.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079284751cde---46036229329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=real+flight+simulator+apk+uptodownPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636E 16308 bytes
SHA-256: 15390c34cb1b53c67a40c2417bcac05325a0759a435d53725c904ad698f5e993
font_01_sfnt_off000198de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198DE 5620 bytes
SHA-256: 40055ad73d1c415251107cc3bd9ace662155944734094a8aabcc23f815711008
font_02_sfnt_off0001abf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF2 11912 bytes
SHA-256: 6be5b47cc5f08691ef27ee8fbda518996841ffa1fd0195b1f6f07301c52bd8a5

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