Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d3846335a5c25…

MALICIOUS

PDF

97.2 KB Created: 2021-07-13 21:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da20c32902f49099e692c6c98328daf8 SHA-1: e79b7ebb731c370a7ae38032c713e6c8819f337a SHA-256: a90d3846335a5c2500ca492c99520998c6ab96d1f77852c60c11d75564423a93
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to these external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9027ca37a---wusunideluworewududi.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc0a36604b---81677607441.pdf
    • https://combrooncom.com/contents//files/zuvimazujatalojo.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4386c297d5b6dd31efacd4431767c9a4/fokafetira.pdf
    • http://libron.pl/fckupload/assets/file/muwodufabagifelofasi.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073c28b5ea73---muvorukojipaxedanaveri.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0a851fb3---8800506822.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/gogirurelagexidipefunagix.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/54695739557.pdf
    • https://mamotato.ro/userfiles/file/19331829668.pdf
    • https://olgunbey.com/upload/ckfinder/files/jefapij.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/i25o2uttej4auu8l3d24165454/jezimanifisexuf.pdf
    • http://ahkjt.com/upfile/file/5814291232.pdf
    • https://yarpaket.ru/userfiles/file/28940839283.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811ddb2220d---divizome.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5291346e---wakux.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b53d3caf66f---41942449482.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c0174bb3---14980374106.pdf
    • https://autoroman-service.ro/imagini_ws/xugisezapazur.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4678dedd2089444d9fc5b5d3deaf3b29/najavatuwilalademan.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae048c699---48584124608.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee71eed732---sopaloriwalufedukajebofa.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/viit16hq13ggrim0ugi9nigal3/38842710444.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e8dd9ad7---92607761618.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+mix+dark+green+acrylic+paint
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
font_01_sfnt_off0001190c.bin
4849a9abd46e23d5c2b5d84a97bf8e759617a9d668b1e1bdbc4d6d499f919ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 17532 bytes
font_02_sfnt_off00014702.bin
770428dac3315d0c19768f701dec91aece7d0f351df3f4201ebca3af46133cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 16556 bytes
font_03_sfnt_off00015d41.bin
363914644f16f5f8904f9bb33d182c3206cd21d03ea10ebc18027889bdbabec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D41 11076 bytes

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