Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b913c21b1fa174…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 15:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0164728837bd44bcdd4d90203e7cead2 SHA-1: 4dbde43c38e71020be43da02ff7ce4dd8fa7eb4f SHA-256: 30b913c21b1fa174de7bf6ae4e7cb054b7aaafaa9dd13d9287c848a2215ff146
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=psychology+11th+edition+myers+pdf+free PDF link annotation
    • http://landpas.pl/upload/file/xonifofigibowuvop.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wuzizenajar.pdfIn PDF document text
    • http://df-2.de/images/daten/file/36551606746.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421214d3dd8---fapebowape.pdfIn PDF document text
    • https://viettrungson.com/media/Files/vosezo.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/xirufokiliratamusu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/50927949566.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/68581332537.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1657ccd42---nonivuv.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/71173580278.pdfIn PDF document text
    • http://jonme.net/ckupload/files/84520625579.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/484e5960e5f2f7b8447314a4581c4b97/30656943252.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/76060463315.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/53069191011.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sakidodinagosuvati.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/zizugegabemawoxebone.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e885ad017a---jajob.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ninu92p3tgv9shibiekn2duqlm/24143360684.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/70376115184.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/xepafomomi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/15736667287.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katezitam.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/27529810981.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61584306210.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_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 11072 bytes
SHA-256: f2e3e4697ea03b5952d62adb9c78e476e0cd31dd7b898ffd6c544306c048a7c1
font_02_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 15240 bytes
SHA-256: e967017913082f124c0929a7e352946c2740191846ac30ed209c86c74c819ef6

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