Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1dce6d322628ae…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 22:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98d5d55fc98d8cafd253505c4e95b01d SHA-1: b519a99c28f0b3a33edd8ddbd2a3944fac8f16a6 SHA-256: 4d1dce6d322628aef1be8bc957ee3903c4b95305ac93414e93dcffe153299d60
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e60bc2c7c---95012273957.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8064069d04---9932393149.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9e6b3f0f359089532d416f7245387049/35356947272.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/12e903fe124b9b6d37b5f23b4a5d7bc9/71783651404.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2bf6d7963---8542615518.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zidagudazi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i96javdie2p2khirbe18alj4d6/gazapatatusarolowurowep.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210714152513.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/jisinukutux.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/9690968147.pdfIn PDF document text
    • https://windsbs.biz/files/file/49550481062.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/53823116799.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/xetuzupajuku.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8036a74c5---vofixigiz.pdfIn PDF document text
    • http://jadeite.ru/images/file/86001572148.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/49510278831.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakirowosaxaf.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160911e698337e---konafubujosowanewura.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a04cc0ffed---geluxujunofifetigi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/lodogikanawi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ugm5m75i31lal8ecqsdg10jnb1/kotomukuzodase.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/lozidigimagotito.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4d168efe---tufezuzubebupuda.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9660261038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=carrier+psychrometric+chart+high+temperature+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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 19280 bytes
SHA-256: d71575e087b4e60f542dc23e8bc3701d984c7d54173b2f163ddb0fc85b9c2c00
font_02_sfnt_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 11160 bytes
SHA-256: db7d843130670507d4bb365fc06fdaf8e0075acbe10a610d6cba8c21e02f9090