Malicious PDF — malware analysis report

Static analysis result for SHA-256 42952592e61e1cb4…

MALICIOUS

PDF

93.5 KB Created: 2021-06-25 13:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23ec3433577d4feb3e17a3ccb689db9c SHA-1: e56a05ac9c99d046b7c7317f2bf153f6fbd77564 SHA-256: 42952592e61e1cb486989a0d921fe745ca5ca6d33a20169aea8b4dcc7f64c99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous URLs, including one with a 'utm_term' parameter, reinforces the attack pattern of luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://inwebjor.ru/uplcv?utm_term=china+eastern+airlines
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb06b02caf---pebolunuzusimevotaxis.pdf
    • https://feng-shuiworld.com/userfiles/file/fogadinegagal.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bc75cf3f10ca0a3377affbfbdec7af26/wenolemutanikonijirer.pdf
    • http://anhopphat.com/uploads/files/89538265529.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a1cc5824---tevepevavisaseveripuj.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3fec8c28---8472021879.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160718f12c6a3a---kizigisudesagaf.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b810cca03fe---xedomeporusenev.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dcac17551---jikaxilodedemujirajuk.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a731cfbf967---pemozadev.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/norukiroxa.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d095747d82b3c46d4d7092b7167f76f3/pidijin.pdf
    • http://analogsys.com/uploaded/file/16710199176089a432be705.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_off0000ff71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16792 bytes
font_01_sfnt_off00011788.bin
7ce03c162f5a25391771061602048a6699414b2161c4265e7fa455d6e44ef139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 10116 bytes
font_02_sfnt_off00012e08.bin
a5ea029b4a4ed3e628c37bc0bcffcbe59b09931ead21d09da78580bcda22d9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 29220 bytes

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