Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e135ede6b1d46b4…

MALICIOUS

PDF

102.7 KB Created: 2021-06-11 02:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ac8272e86c8d21ea82dc62426a8d305f SHA-1: 6be215ab190798c6d76e1b8ac798a67ea1919088 SHA-256: 3e135ede6b1d46b4aacfa8c3fa4fc7ab9497113951644b9df491f095c4846e71
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URIs that point to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The document body contains search terms suggesting it may be used in SEO poisoning attacks to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://smidgel.ru/uplcv?utm_term=shin+chan+movie+in+tamil+doraemon+movie+in+tamil PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e8c209fe---nasopevibi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9b3553d2---runimazepanisi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85fb19d28f---61028011270.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/84677304516.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523022436798164.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/07a07835a339fa5415f4f106afa84bc6/wulizanugek.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/94924164906.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d03062c2a---kekupavoxuzijuse.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0f6035595eb70f9dff24efafbfd24ad2/winuxiw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969c5dbd03f.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/84603750068.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bnvk9to7i5hol40uudcfoeceh1/ralesawixiganikowidemoba.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442d6ba0ae---56589681569.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e1ad731f---mukakez.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/dunowadum.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xawapelavebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 15972 bytes
SHA-256: 8af3821701dbd8ede499c1de0adaee1cf8e4f24caff036a5dc3cfa7025390b69
font_01_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 5164 bytes
SHA-256: 4f19d6d36b6068017473b3a7c6c981aab32b08afea73f1984287ccd4ece5e70a
font_02_sfnt_off00014394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14394 9504 bytes
SHA-256: af59fa5be986f24d08f53462ae54bf02fdea4f25094293f4c328a8f5fbc5212d
font_03_sfnt_off00015e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E42 16112 bytes
SHA-256: 13431ab2bf0e11939dbfe41e3ab5d460b6340c8ebe5f8fcf4d6fde89402d4c73

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