Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df79f51316b5f84…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3884b52c390ad127ac1bd388b30ab04 SHA-1: 5487ea1c67a079282eef5de3f5035411db35ea16 SHA-256: 1df79f51316b5f842809dbe73712198d68a1ef3e0547ca1fc048ed609d3aec15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://viorina-deko.com/images/file/lifezepisi.pdf In PDF document text
    • https://alpasol.e-giant.net/upload/files/wirelewuwiwulinedaxom.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80040970464.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/xivetodo.pdfIn PDF document text
    • http://bankerz.in/qpic/files/76646832455.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nawawalewupuzew.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/guwuxemaferirepaxiv.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nolimobuloxazakozel.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b07dd022b151b8230f098d15e1593d52/89356591053.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lesomodeperugoketozikowuw.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/safagomerixupexu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf7de27f4---xaxan.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xuwunolovukiwufogizesif.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/tafidezemipik.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/55784851043.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/3792359094.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/sajuxagivizazetesutofeti.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/39492443370.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/25216987929.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091312570473499.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/rolaziropisexitomovi.pdfIn PDF document text
    • http://altus.pl/userfiles/file/semevagimube.pdfIn PDF document text
    • https://tele-video.ru/upload/files/rurobujosaxunurawovaga.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/00ec0a27e34e869a123d2141abba6af9/pelikutedilodutalozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=o+reilly+android+appPDF 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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10256 bytes
SHA-256: 3d686d83b6ca963eef9238c77ea9bef718d38d89dadbdd159ff9d3c2adf6fd15
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 18076 bytes
SHA-256: 90c0abbce9dd063a5865ed35dbdae3c152d8e8b6cc45e680f9ff3db3e12892e4

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