Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e206493c51078d7…

MALICIOUS

PDF

103.3 KB Created: 2021-05-26 01:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 61bea074a4a3632928a18d61468ecdc2 SHA-1: 227cd05aefc6bfd6904c810ac34e8f9c590d7674 SHA-256: 3e206493c51078d72f30d4cc4fe58893f4be3c51fa98cbcc16659ea963ae7a04
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs SEO poisoning tactics by linking to numerous compromised WordPress sites and disposable hosting, likely to distribute a malicious payload. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=periyar+books+in+tamil+pdf+free+download PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609024dbe0cbb---17575784241.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e31c16f2ff---83390456337.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-15/20210515012959106497.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nonn0gdq52di0b0vlarme7t6l2/93368183083.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0928e6750621ff45e5b4db85544a156e/35674412299.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e261737032177b7df39bc7939580ae74/65225695025.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f30ece82---33278059285.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/92aa39f5fe826bcf8d72f30e7cbd2da0/53780566404.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160906f5648968---severemaxopevopomaven.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b15c2a0fb---32339925139.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/22605922865.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f0f1a2afb96378cc1e0f8a726b26febd/84923782959.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad703553ffb---1346498565.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/nqnvmb2jrbf0jtkkm27mo5it5q/36184483129.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/53788634893.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jezavajajuforozifa.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000143cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x143CD 8896 bytes
SHA-256: f0e1bc8fe81477a1630096031f3196ebfa43533dc79513bd2d8e2358e96f6051
font_00_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 5588 bytes
SHA-256: 198addb47e06ea1b9914a990ad268aa99ad40baf42904a654fb8209e4a57de1b
font_02_sfnt_off00015b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B97 2560 bytes
SHA-256: 0c6e8f9e9dc9214e97e5c972fed9471a4144cbaf3a18ac52663d36a3d7c3c4f7
font_03_sfnt_off000166b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B7 12180 bytes
SHA-256: fa81cfb39494264ce643dc172fff61f9210c1240e3e0cdf82ffc4a3c979e539c

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