Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d08943322a746e4…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 12:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 165136639a157fb631d817127da72f73 SHA-1: f1b48d840d1d1054da8c637ba53b91fcc80328ec SHA-256: 1d08943322a746e4ad9f13b60fb07cb5ce95c523215e6456b72afbd689553521
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://kielcenoca.pl/files/file/67801471543.pdf In PDF document text
    • http://nuestratierrapremios.com/campannas/file/monisojejaw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607c544e274be---68029385929.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1441fe14b152263e73289b6826185f1a/koxes.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/15369838249.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608406351740e---247993420.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/48333468223.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83c17af69---29236982086.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/sadixovuret.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609e79eebec34---69195222387.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/34360272316.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3101ff441cf4108854bf340d3c7859f1/43491988655.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/26049575043.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a513b0c016d---85841321602.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46784727554.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/zulevitufapoj.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2kc8n7vunql21o5almm6vjfvlt/zabijibamaxerowalada.pdfIn PDF document text
    • https://wrd13.com/force/file/18252818863.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/zenepesimisozabigugavujig.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3985c9885---7574343110.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd433af7eb---99105619495.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/38319514356.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/41205476065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=blood+from+the+common+carotid+artery+next+travels+to+what+two+vesselsPDF 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_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 18376 bytes
SHA-256: c31ecdede32615c0e75a0908493a8e28cfd92ec35dcb2d41f5517d23a32c1e96
font_02_sfnt_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 11160 bytes
SHA-256: a8ad129f61843f1adf4e736d81bd994e73a4a044482077d0727c1d86583ebf00

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