Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c49b0d384c85b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c964009391807e39458b7485183111d3 SHA-1: f61adfe495a05a71684f6b8154fcec70767f2734 SHA-256: 9a7c49b0d384c85b123d68f63852a15feab80d1081c52c64f82a36f38b9cc8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates malicious intent. No scripts were extracted, but the overall structure points to a lure for downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=best+pdf+reader+for+pc+download PDF link annotation
    • http://imhkayseri.com/resimler/files/noresin.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/92332817835.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/86512ca91d56ed5240e9288a85e73156/gemosujokojekexe.pdfIn PDF document text
    • http://chinalabware.ru/d/files/zunifadebawalafug.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/19ee8d9f74a13e9ca1ce87f93d373146/bafabewefarawulejow.pdfIn PDF document text
    • http://limoride.net/gallery/file/godizutetovorupaturezuti.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020f992bee---guginapakotes.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/gr2fp0k5fvk0vg37moi9vlvdbg/fuvivivowuridiviratud.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/52861378124.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e866445824---62804159976.pdfIn PDF document text
    • https://oliogalanis.com/file/51075613976.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/81925752120.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/mefafijubenavumo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cded9397f7d---96103803122.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/49926912651.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/kokoraju.pdfIn PDF document text
    • https://hojoairport.com/images/file/79162518074.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/59280676960.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/nilefozufejelejogoduno.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ac5544d4---55882256013.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/sajuxa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85036374f2---56132892592.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071ce9824e---womedowibenuveroji.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5621f00e---84047567186.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_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 18136 bytes
SHA-256: 880c884fba9af5899f008897a692d6d80495d988a2b17242a3a64af0b6694688
font_01_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 10660 bytes
SHA-256: 552b09eb08ed113b9ee274d1fcbac75ab0909fa9acebd8502a420cd56dc6a8de
font_02_sfnt_off0001392d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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