Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82cc7e0488ebc4d…

MALICIOUS

PDF

95.4 KB Created: 2021-07-28 00:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5e0c12a8d1b746c047e16367ad93787 SHA-1: 04a52bbfee1a5cb4413e62f08269feb38c557089 SHA-256: f82cc7e0488ebc4ddfa6f0132f466069516a92b6d41e9aa9df8dc545b356a34b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072affee6b11---51797917831.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff1747dc58---43452890798.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/xagabiwomixezasenumisefor.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/8987562081.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c8b88bba---rozili.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/vejit.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/fupasijilaxozemojudu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/56821870293.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5af1f3da---zisorugumubebufetike.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/kuduju.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nudokelamug.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/tepojofafevovebopu.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/topolaveluwi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7e42c74ecdcd78bf542ce4db7f1319c7/kamozidilomeviwitob.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/gunezerolujaxugoboxiteg.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/41081704465.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde8c29056f---rawurofezorokijoz.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/12817451911.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/75164512490.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/bozasosamapasozu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5457aaa57d---16171846507.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/56045702411.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/o7lg3succun9ut96clm2sm1hv5/26921584102.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/16e2e0747c54fc994672f8e370418a20/nivetapozirefogujoxak.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28de9aeb5e---55777801652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+improve+dinosaur+comfortPDF 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_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16940 bytes
SHA-256: bee0b3c4e02cdbfb046c0a04533183f5e394fb8e85bf7715dd9e0f3e1a23f066
font_01_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D0 10976 bytes
SHA-256: 5b3f29ce9ab21867a79bd9e697b55664d5f83f5a5b3ab0deb5107932f90bf6de