Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc59f650f9049e2c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 07:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44934a96b4c93ab0ace76249fdf350fb SHA-1: c43b1d0346975d72f654faa8787f9dded8fa7029 SHA-256: cc59f650f9049e2ce343d5f66f1d5e6688640ecb2e87e7b6fcafdcc772027961
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myvideoclasses.com/ci/userfiles/files/15993343016.pdf In PDF document text
    • http://torremaggiore.sitmap.it/files/files/99221717065.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/94543004286.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/9366564732.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/xapaserugefijivug.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/najokamolarixale.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kevukipezekujov.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140edb9bc38d---loxuguwisajodelutemesak.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/wolefoxepataw.pdfIn PDF document text
    • https://tekartltd.com/upload/files/luzubirirewur.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210921040949.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/lezegupidazawep.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/joduresetixatawur.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614994263c38a---tuwotilevozisim.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/52311979895.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6d2d18a5---nikusazebebiruwadagutasuv.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/vumirejokiwixebozawezerav.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/golutuvinuvu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/5257889146.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109222034555074.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/volosegizofimipipumupobu.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/25770527636.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161488628ef774---56114058603.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/tikojokezad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+network+explainPDF 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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 10620 bytes
SHA-256: b8184befb7997f7e160c2e0631685d8ef9c9a6017d54df4ec755ca9f4f4baa61
font_02_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 15144 bytes
SHA-256: cb3307577861c02f2ad40901c12e1b6fda39fe4622bf62da5408af900b4f5df5

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