Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ccc580f4404275…

MALICIOUS

PDF

78.5 KB Created: 2021-08-28 08:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eaef9febc6c15ae4c1cab2e7f3ba580d SHA-1: 95c3d80b93dff9adce58e791d088024fcf86fb63 SHA-256: 97ccc580f4404275ee3fe002320b84ad1c59df88062ee3ed0a52c3f3df4d0dfa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/30dfa829957da4476a42e27d8d44eefc/warux.pdf In PDF document text
    • https://davidfoleyinc.com/userfiles/file/41028350003.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/savetova.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/59725512518.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/jovuxobadalexe.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/17162895134.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/95139392096.pdfIn PDF document text
    • https://wagaskar.com/media/40091959107.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/mopusazikamukibiwikonu.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/17526136200.pdfIn PDF document text
    • http://0930actress.com/files/files/tokapivatebipan.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0b95030f---34131506203.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080258ec2c48---64551587915.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d970d2fd87ec15ef84a73f195bf39d3c/bifamuselerowema.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/28339521763.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8884ab55a---75392788007.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160867facaf9f9---vanube.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a64da06d1b4---mevafikazebunojiv.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd3f14529---70719806893.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f4844f98e0f08be834f8d71d5c8bdbaa/23281039866.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a90b13df5---9948251334.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jjfcih9hf2ipf8temife6250c1/kakasulanojamosobugol.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/68594411444.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/53091257093.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/84014528903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=prophetic+word+for+november+2020PDF 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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 17212 bytes
SHA-256: d28d799a8c5614a2816479807736163d2e321ff7639f65116f6d7fc560f59930
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 11044 bytes
SHA-256: 7d7fc2719b77d8c362aa581e28d9a77d78317577b51b2e1067425c4606f98dcd
font_02_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1