Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c168b2420d9758a…

MALICIOUS

PDF

93.6 KB Created: 2021-07-23 06:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 219768b499767333a88713b78a2c186e SHA-1: 46d5e9bbfdb0061a12b3d25996db7cb1802f3fd2 SHA-256: 8c168b2420d9758ad125c3cd71345f64481cd28574aeb22392c5db88b64410b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The file's structure and URL patterns suggest it's part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4f888c62c19c554a34245d794c19d7ce/95260693406.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/q8iaoh08cjfhs3pmanbcgmn760/193751596.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac76dd49e---85441093556.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3606dee0---tipadexixorolafe.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/1612566840.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/28013908442.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/bosunode.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160da60ec7b64a---turavifuxanuwik.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/nanifitepolatanivakotije.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef794b66e---jipuvejajeduparutatatof.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/gv8sir7nsuk2ni366psbj6070f/temitesafewevewaxagi.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/qu3v991r6ri7b1sblejdghpbqc/49548151494.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d06e7e0e6---bavogi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca2d592e6---niwelazomuwuwizikowilinok.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/97216399546.pdfIn PDF document text
    • http://jucal.es/images/file/50628960864.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/47057512159.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607357a6797f6---48586931846.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4878e695892df5233890bb6e68a1516b/goxudib.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/34191571347.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bb73f4080---dalodexibovovuf.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/dudesomusonekibem.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c621112a---vuzosuwumuwebegukenal.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f98f9d91119---8993000347.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/36901289841.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/61464611568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+eat+unripe+avocadoPDF 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_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 19164 bytes
SHA-256: 8741011b6102b3acbf8980bde1494022b946e5d130677f179226bdafcc5a84e7
font_01_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA3 10604 bytes
SHA-256: bb11eb5bd0de2aa15525bee1877bf42eda012040038c501193a4b11bec73be47