Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acb95c99a329127…

MALICIOUS

PDF

67.1 KB Created: 2021-06-21 09:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1090a94effe1f66f066923945db0acbd SHA-1: e33525db397381fe6a5e28ff6a1c655409e9ab69 SHA-256: 2acb95c99a329127815d1a3741145c2f9be219e8c1af31890fbc48ee25af22a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d44bb914---213925092.pdf In PDF document text
    • http://wanyuantemple.tw/userfiles/file/vuzosewubefapexozizelivi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2748bb794---zekikomadibivamesulis.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/vofuw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/heipltli99vnunhfrscr8msd87/81036994050.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c32bdb85841687bd231718ea0e8fe1c/pozorap.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/88694875425.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f821e8960---daninutebegakunokiduruxon.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1f4c26e4f3d25e6cf98211e3bb47997b/mipep.pdfIn PDF document text
    • http://kotolantopeni.cz/file/55075409909.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20218cbbde09b7da50a00557ba0ad149/67548351251.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815ebe64a1---xudule.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/71780804944.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/xemolixufiret.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2d17a825d1c84d9cdc2e96f1e3296028/laxejekijuteka.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bd2a5f32bb3e64806194cc68429c23bc/virozivuwabodazavidaxu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0614eeb64218b7badc29b07e6d581800/4711445480.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/~3/3vuEKuznOb8/uplcv?utm_term=ayaka+ozubulu+songs+mp3+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 5784 bytes
SHA-256: ec7a654bcdbbd9248b4164e3769dfe864661669878a259f13e3566eee9174918
font_01_sfnt_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 10380 bytes
SHA-256: 8eb5f51202ebd51653e17ed3672d777331c4eaff83aac58a95884df1880d426c

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