Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c48321e984260b2…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 01:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dd7fedd89d2e1c8779375e9c4c35cca SHA-1: 7056e65f9cc528307270a336cc84c7b6ac8da853 SHA-256: 9c48321e984260b214f01b5745699d568e93859e9a13945e9b8510d6a6a48c5b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=information+pyramid+pdf PDF link annotation
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/bb53171c425322c89d57ea5a765d6190/95387803197.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wekitulezudi.pdfIn PDF document text
    • http://lordoptika.hu/files/files/79111863870.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/48209607723.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/nafojidaxavuzepukezax.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tinomusimitijebusazap.pdfIn PDF document text
    • http://cartopack.be/Images/file/wawanuxon.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/n3bh43icd09ppt64bjd4q3kml1/24485686452.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760a793a43---80946257384.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080411831e---jawetopezazugizowepesi.pdfIn PDF document text
    • http://termocity.by/pics/files/depin.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/mevifu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6398be272cb17d95caa0313a4d418ac6/lutane.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/31544931493.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/fojobituwabifuzawulirovaz.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/katavugikupejemedetidivis.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/34367959320.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7ee9gkioh2en6jmlie1arjhd6b/95029404156.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766df0d6476---26298526410.pdfIn PDF document text
    • http://teplospectr.ru/images/files/6821226155.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cd4b0a1c---muguferedoxifosig.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/20014627386.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_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 16972 bytes
SHA-256: 7d1a2941e22ee4814ad4ed3e7a8a6d6f0dba2b1a57090b37a5f9eda2b1a247cf
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 10380 bytes
SHA-256: f7cf9658f2cb85dd95145a356206e12250c0429abc6853eb81910a144e4de268
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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