Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a91a762f84f74d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 03:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3c8f7f6881cf536acef29c4d3cf98ee SHA-1: 43a470e0cefe14dcc339cbd877cee159b8e4eb8a SHA-256: a5a91a762f84f74dde154b3339478e2dd435b336b0d703f3083ceb93f6f0eaa2
156 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document's structure and embedded links suggest it is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9ce7d3f48b48b2f8d3aeb2859f77f106/gedomazamotupejokof.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/50447016182.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/nezejalumetapuvukiwatef.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v01vd2ng8coacr3ri6jlaneko7/laxilekegugezuxajiriwa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3f30e6505---49316961759.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/86331837787.pdfIn PDF document text
    • https://vientangluc.com/upload/files/tajaletuvaserudisuxigoza.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sebaturoperuxidijeb.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108191312411202.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/bumojitavoledapepekufaked.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/72420135174.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/vomesilonarez.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/99e30d52d4353cf764af2d13813e6a48/61596135514.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lirududunuboratadomivamir.pdfIn PDF document text
    • http://intersonik.eu/upload/files/12957415139.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/hc4fmlot23tsn6qgmkj1cqveu7/dejiterotirotapapoliser.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/6095276792.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/216292062.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/989e20e1ea99fa78a11172dde39ea1da/fedirejijivolomagelopoka.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kavipidoxizerobewodumi.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/temisegilikuv.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/fepedogewetipatusesowope.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb6c9f5f9---52675385022.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e756d9bb---dotijori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mathematical+programming+in+c+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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 17956 bytes
SHA-256: cb75650cf61f17c4dfcdd7f52a53c6b51e41ab2b00637df70c57619ec49894b4
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 10892 bytes
SHA-256: e2b8aec0539c9b64d72b3631fcf9f4accc84a905f1908879cf90952f9f03109d
font_02_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1