Malicious PDF — malware analysis report

Static analysis result for SHA-256 a497b06e042659f8…

MALICIOUS

PDF

82.4 KB Created: 2021-08-15 18:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fd0924bdf2266905c04b513e78820e5 SHA-1: 131abbe81d99edb45337439df072c6dc48cd28b3 SHA-256: a497b06e042659f8e81b1083cca878cb5384610fc31406b1275df7cc2b65ba25
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cde604ea4---9324124986.pdf In PDF document text
    • http://bitree.net/ckfinder/userfiles/files/pojoxelot.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/42440229451.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ldi55qo6n2774h176a0id5h5ha/kilosawuram.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160726ee653003---lujudegorajuzevek.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ntf1ufensf4hcb6024002g1l00/zefekilomogavazoz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce189c1b69---bawed.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c3264c5d---20207231587.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/givalavovuneburozaxevex.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/weluwefegawujidu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/dejafe.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab31d09ad---bepilexozixadatalatos.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/62255342080.pdfIn PDF document text
    • https://negaratoto.com/contents//files/69039657989.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/lowovugovedunozisigivumo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e6919dd7f7d1f857df6927efcdab189/2109167961.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/winalakef.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/sukotabevolusonufi.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/ribexejodozixepo.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/vinixa.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2d0uobnsps5i1gpsgurcdf7u83/30928750489.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d7a5140d---35969714291.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/redabulixizaxutirif.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4cc7736c---buroxifozot.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1955c90e---78291782730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=winter+wonderland+sheet+music+piano+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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 11064 bytes
SHA-256: 2155b9f477d803b73242c4df882b5160fd9e9236d8d72024073b7bf1e05b3261
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 17312 bytes
SHA-256: c453ddb7bb6fa1cac84e8dcf00c6c39fa7739501955e6600a0f5b2410fecfc57
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1