Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd89b4880faeb32e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 16:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e6151dc35078565491af8d24510b83f SHA-1: 16325e271d123e2a087ab81cee2dac91d1e59cd9 SHA-256: dd89b4880faeb32e11785054873f30aa77d9bfb7ec3e46a9c97c2166b6a6ebab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms on disposable hosting, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the nature of the linked sites, points towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://peoplefineart.com/assets/202108/files/20210827160603251997.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129f603d6e---ziladenonozibo.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/65063008452.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/pevoguwiwowomotusa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/469706d877f6b7684dda794db4bdfdda/zimuwabedevirenosi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xewinetixonuxukiwigesipu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/246fb4e3e42c4a5567e4ba614ffcc664/14555117844.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1344734398.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/gbd4hqeh2jp6bgneju747oe27k/givonalekowes.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f9691222---ridasopixosago.pdfIn PDF document text
    • http://nadamasristorante.it/file/wikilavamu.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/tenuxijoni.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/87743060808.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/30134953182.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/570906d954d1e82eec17477a730ee21d/89019364333.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/veripewibidatezewali.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6566de37cf---22935699764.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd177c1ad72---95159579977.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff0417b7dc92f9c2df3f727bf48041a5/denetidipabisi.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210830_5810c.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/beput.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/14qiaj1gi836e9t4ik00s8nls5/sulomudam.pdfIn PDF document text
    • https://aedwea.com/upload/foto/53154439034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=introduction+automata+theory+pdfPDF 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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 10836 bytes
SHA-256: b8374bf0138b8acda9de5c3d145f3dbe9d163e38b65bc592aee76113d3f081e5
font_02_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 16100 bytes
SHA-256: b58366899a24ee32b93a6139ecef5a193f1b0a172002c61fc18dceceaee9bb67

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