Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdba0afdd4573a88…

MALICIOUS

PDF

76.0 KB Created: 2021-06-25 10:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a52143cd2013706bed719bf77bea5db3 SHA-1: 2e3eb268d9ca0c85a59f3665d542ce698c4cf4ea SHA-256: fdba0afdd4573a8865019aa02276568f21ba171e6c3945038ac1c6c62e41fb75
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5idqmpfeg80rllv3mtuf18phn0/65040527316.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3868c26a---84663991171.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c5d537bd---sexoloxezej.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088335f1387e---xetobelopa.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7336248b2---61665655645.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/i03mmbhop9d1e6qmolbme8vtu8/48845515709.pdf
    • https://digireg.nu/upload/4121153411.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/vivoxariwokedezunupim.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2ad2ad8ca981d1b537c94a3085536ac2/fepavegagewobotev.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addb3dbebc5---fukiximaxa.pdf
    • https://activepymes.com/pub/file/xetama.pdf
    • http://rocb-ap.org/file_media/file_image/file/luruti.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af54847dda32f2860b771bbc65c9283a/85758852965.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c39247a7---32264920234.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sample+youth+empowerment+project+proposal+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea97.bin
f1db3a482c906de3329a790432060988c711b50154f80458befc747ecd206e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5768 bytes
font_01_sfnt_off0000fe2e.bin
be1a00172d45a656144764e0813bc4067f790cd533b8e99d7580898c54b9160e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 10804 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.