Malicious PDF — malware analysis report

Static analysis result for SHA-256 7434a7d273313d2d…

MALICIOUS

PDF

90.4 KB Created: 2021-07-17 10:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20ce5394f4b07facc5577ec0aa00b91b SHA-1: 3ee9ecb921f47023c39a9f26ad46ba1cb142354c SHA-256: 7434a7d273313d2d0807e7d4343a407db908e491b0745e36815ed91819bd4cc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.kymkarajok.net/tiedostot/files/54900538903.pdf In PDF document text
    • http://boldogelet.hu/media/rajuvaki.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4825ef42---27732571238.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xavef.pdfIn PDF document text
    • https://airbays.com/userfiles/file/44109846909.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/04c05c6c68eac5e4106ec8083a744768/zesizirinog.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/33982430754.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160914aa906179---lajuni.pdfIn PDF document text
    • http://mldinsaat.com/image/files/fisozizabetiwapubedaret.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/76593694593.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/65aea14e786fe54ab5bbea081ec25d49/kazamibidabufajebuwod.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/votuzuxavumukuvagumuzona.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a93338dd---54799686053.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ea54592ba9d45c27c5c9a8576f7a79bd/mitebu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/bufefakasojemo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609297a7d3d56---wipez.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a106b933---dipumorase.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/dekofexenorujuramo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qug7pap34uc2h3jvit1511b3sv/zubinivub.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58b529233d---61039829551.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9vaf3h7h40rlgavjn3c0kq77rd/vujipinavetovutelujisa.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/xopurubuwazurapujilaleg.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b406706b---88438238964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=standard+unit+of+electrical+resistancePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 19140 bytes
SHA-256: 8b6d56e7deaaf9e60ce990f2269c8cd331b42fe7209ebe1f47fa9457b5fedff1
font_01_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B3 10644 bytes
SHA-256: 2a8267ca76466bba2ffd919110940b93251163eeea763c416f1542e205f0f323

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