Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba59eb40dffdb8b…

MALICIOUS

PDF

93.0 KB Created: 2021-07-13 07:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87156a27bd68843ad2043dd2a19daf9d SHA-1: b0ad6ab3b6bb7834ee740e37ecc563e51ab58e30 SHA-256: 6ba59eb40dffdb8b585de719ebf6b53db49d7bab28102665af97b618c924c93e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed that the PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://synerhu.ru/uplcv?utm_term=how+animals+help+humans PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f2dbbc176c363e96610e98120d44de3/67209351548.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d5a4fbb5---63269864058.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/fetijeju.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1de6ead8938af1cd6884e859ea5f0f32/77679129115.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091478a4c030---69369502361.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c7b509e4---bonidek.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c68be124fa0---95419429455.pdfIn PDF document text
    • https://dptech.vn/uploads/files/91517921380.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608333a3556c8---49202238929.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/josuwexivizeraz.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3rihkdsf6qd8vo3j5qev7ib68/41944881083.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ff17658f---85528242111.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cc154857ad91e651ff664d30ad67c967/dijipavuwov.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/faxejofavujigabuwiwatubid.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/votamixovixa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vk5ocqv5jk7592jrb323behvlh/44383403302.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4f6f5bb08044b634e3d78db0664b433c/77436391826.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/86119745015.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7c059fbadcb3049b93d5dc18508cc95c/lakatelajawosezozumadomi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/jabigivesekatenezadejesif.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lonokowojakef.pdfIn PDF document text
    • http://tencanpowder.com/d/files/wumowizajokafaparovuw.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078dae8bf094---dadaso.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fizaxefewunudezexufoku.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f89d3d9bd---jetoruxawowemenatuwore.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d501af036a---zuxusazosanufatafobit.pdfIn PDF document text
    • 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_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 10496 bytes
SHA-256: cc28976a516d40584e19b55fc443363db408a7f5d8911ded64f73e174fa4edb7
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16832 bytes
SHA-256: 69a5d0c33b89ad22c54e88f5f587edac78052fb84b87d269e26998fefb8c8282
font_02_sfnt_off00014e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1