Malicious PDF — malware analysis report

Static analysis result for SHA-256 457cfa17b1ad2a80…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 10:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2a87c1f2fba1a55edec948b0d9306c7 SHA-1: a040144830747e60aaaff6b3eb082ebbd6e9abe3 SHA-256: 457cfa17b1ad2a80d19a5f324e176f6d704d4bc97f5cf4bd5b43056544cde0c5
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://huntic.ru/uplcv?utm_term=block+craft+mod+unlimited+gems PDF link annotation
    • http://tryinvest.eu/userfiles/files/xikenufokowa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f57287904---janokusexujamadim.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/lapitozoxezoxonuburupag.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/sivotupalimu.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/42960654225.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/87764307233.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/sowuwoviju.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pusirenupagotomagi.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/nafumor.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/46233395524.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jovoxuxafenomimi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///waxovoduxuxipigubilored.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/3226076806.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/wokarofetatimasemitosusuk.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b057468c1c0eab1c9173556e257d4500/retikobilikegi.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/vewudamaguzebevoxite.pdfIn PDF document text
    • https://ikansambel.com/contents/files/pofini.pdfIn PDF document text
    • http://szwygs.com/upload/94165454618.pdfIn PDF document text
    • https://podimercrm.com/img/files/68340030935.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/42510437776.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/96968015849.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1bc3f1b2---48704445132.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/45651003012.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60778595003.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/68035634822.pdfIn 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://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_off0000c053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 15640 bytes
SHA-256: 1f9fe0cb416c1bd12b3abdd695bfc413ebbb6840d555c616fed1d7d63d467eed
font_01_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 11064 bytes
SHA-256: 642c54ddb376b92e26a88ce5acbdd48f11f1127e68091739f1ace35850230edb
font_02_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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