Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ea1cef1ed5d50d…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 00:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01ce7f8aeffa17740af1a5a952c5bfc0 SHA-1: 9c5d3b0d19ecc106db4dbc452e2048b46ea26896 SHA-256: 89ea1cef1ed5d50da3e481a50a3b540215f11b0f698064fa316790f106f54eb2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest a spearphishing attachment attack pattern designed to lead users to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=mark+gatiss+game+of+thrones
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/91502009c7a2a66be49e28d1fbc9fb6e/sokewixuxujobakanerov.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608507cccdd31---losunetadanazuvubo.pdf
    • https://anfauglir.com/images/file/16144544724.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/wabelafabel.pdf
    • http://headrepublic.pl/images/files/12574020099.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f28dd6dee---88184073874.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m1f6ee5smdof19jpimppipaeuk/45354772540.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58dfc08aff---jemujafi.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83a10aa2a---jefesuxukalobi.pdf
    • https://angkagenap.com/contents//files/76165645450.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65c9cb0c1f---53391095458.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eab36833a---kivaluku.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dl3c5ujie1548fj5t02u27ftik/54466940136.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad7461d4f---93881963411.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13b41b06a---22885100992.pdf
    • https://lasanisports.com/files/gowagaxomi.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/newulamarizod.pdf
    • http://a-kamen.com/userfiles/file/30234038928.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c1f47a3c---nofukoduwub.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a325c9149---76138496959.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/88999115192.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_off0000e9e3.bin
85252b6e02825b83046764061c7b9e36749d01330573d76a9b772154f93dac14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 16980 bytes
font_01_sfnt_off000115f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 16792 bytes
font_02_sfnt_off00012e0e.bin
1b8698a01808dd1b412791d0e2c55126c3819a1089966810b1f7b68f6c888f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 10700 bytes