Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5e480f63d1bf5c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d5bc84b026ebd630ef360a411166828 SHA-1: 0d2f4209d3181592efd7ce8c137e4674f754a8cf SHA-256: 7c5e480f63d1bf5cf90bfcebf957e5de6a039cce1666c62677674878a8f12aef
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. The document employs a social engineering tactic by luring the user to install a browser extension or update via a link. This link points to a PDF hosted on a compromised WordPress site, which in turn likely leads to further malicious content or execution. The presence of multiple links to PDFs on various domains, many of which are hosted on compromised CMS uploads, suggests a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f8f87375e6a256a5f0a521695f2b1e0c/wozoguwinopi.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/80366853629.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/32539472931.pdfIn PDF document text
    • http://cx-gl.hu/images/files/34288581309.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/83607166770.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e30684ca5---kinuwiran.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zilojozepirin.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/89246474084.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/350612950dc59324d8132ce4efb00b92/kofupulepulomijiregolinaw.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/seranafaboz.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/botogarovosoj.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/4885672175.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/799af82c58f3b35b1509c23b299b5bdb.pdfIn PDF document text
    • http://4bx.pl/public/file/63813941402.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/megovomegejada.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bipebaletonalak.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/486595974.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/dosugapuxoximulusij.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/nukafugenifumu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d950512afef727a0713f6936bd30bc1/sokegesazoxapigotudu.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/42746355927.pdfIn PDF document text
    • http://timebymtm.com/upload/files/88214530256.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/92531794739.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/78981414359.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/304eda29510784fb0a495ff1092cb150/74394920534.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/87742972528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=view+session+in+chromePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 17284 bytes
SHA-256: 2a5453ff0fd9b8ac8e62e3a4484347d77320b30147df7a8cfa925bd9965a5a37
font_01_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 10244 bytes
SHA-256: bde01ab95a7ff78e9a156259d8fced9a0893556d7f9ef6cd635d9f3b69cfa1fd
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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