Malicious PDF — malware analysis report

Static analysis result for SHA-256 5385410d5dc90027…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 11:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed9b3767713d6f1202c824b1d21904d9 SHA-1: 3117f5a1675d6d0b7c7cfc5fa3776c63e4961cad SHA-256: 5385410d5dc900271bcd74ad52d232b4ee9e87e56696b348de8d5ea7656a784f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the presence of multiple external links suggests a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://hinodanang.com/uploads/image/files/wupukur.pdf In PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/78565793538.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/jidisofejavuvixusowu.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/4618631803.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/alg4q3urq51iu2s6n4o0c8mqa7/kerowujowudomukorufew.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210902083100.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-12/20210912142141195008.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/padevamewubedevezor.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/48270168295.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/93493477063.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/5241045917.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/rejedinefojisegomajan.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/ligubewufo.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/wunufijopuzakabuv.pdfIn PDF document text
    • https://biocoils.com/img/file/dorifelilupomezoxepozuj.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/botuxakedadira.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/31010210792.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7b435dc3---40423105068.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/nubanuxowinafoka.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4632b998d---dopokareziwubi.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/webuvezukozobuxupaxekom.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/muvuzir.pdfIn PDF document text
    • http://schokozentrale.de/idata/nepomuzexubufoxezowegasok.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/nofen.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/sotedebowasazagebegal.pdfIn PDF document text
    • http://etkenkalip.com/files/lilafobevo.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xonovusezijujexefemedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=naruto+shippuden+ultimate+ninja+impact+isoPDF 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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 16368 bytes
SHA-256: 05b3322b558ce780ae64e520afac39f4f249b7fe678450a7c564d91f5211f318
font_02_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 10984 bytes
SHA-256: 0eeabd138c9e23a25231614d8c38972b79d610221fe7a1c1c3480a289ba7b784

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