Malicious PDF — malware analysis report

Static analysis result for SHA-256 880a8b54e98c1dab…

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 19:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41a3010a90ff65cad963a728966edba0 SHA-1: 9bdf381a17a3f3e12433a6289fa44655939dbee9 SHA-256: 880a8b54e98c1dab2f7fad648e2f77707b1c5a07e7e2fd8fbe50a9731331b1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of embedded URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59d231baf3---71731578674.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7ndj9d9cgdatk5hjvrukdgf546/32708911396.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2a3347904be7ba272ecba100a85d7390/64134906411.pdf
    • http://rowanfamilyreunion.com/clients/28915/File/tedadowudar.pdf
    • http://mp-journal.com/media/file/dananige.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef13f719981c61e13b0f16a7c362f95d/86028619392.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/dagorumolido.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/netanolosizamafox.pdf
    • http://robalton.es/Albums/images/file///vivawaxeg.pdf
    • http://dok-vo.ru/userfiles/file/dusitebixojifejebu.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e694c4e5f---vufame.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r6gantt0dca491vin3qh1iqlv1/29945791090.pdf
    • http://dioceseofniranam.org/userfiles/file/30247381506.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c3a3e9b6---87260570262.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ecb85df7---poxiforegumer.pdf
    • http://abpaluso.com/upload/file/duwomefetise.pdf
    • http://adria-ex.com/images/blog//file/4862219625.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860b8804ab---saferuxibubesi.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/38731471668.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9a29cefd---99643208551.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086053be880a---ruxukokegoxoxizunefe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mississippi+foundations+of+reading
    • 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_off0000ebc6.bin
fe54ebeec0802c5b11dc0da4ddecc162a6d9f1fc0656de1559121a53aa2d121c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10720 bytes
font_01_sfnt_off00010455.bin
dfe8f1da319017df0ad8c1000564c58ed5c3b055264846612f42d56fab179a8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 19152 bytes
font_02_sfnt_off000135c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 16792 bytes