Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6df08834322b319…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 04:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4ecfba1265236dd20d7f5019c92d8932 SHA-1: cfcd4ab9da774a4689f9e9e6c4d3aa891fe7cbb4 SHA-256: c6df08834322b319632c1521595f8ca53555dbcc92ea816410afe5dc5ecbaed9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, a common technique for distributing malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a trojan delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d230519d2be---51259021378.pdf In PDF document text
    • http://murasakijr.com/uploads/files/lewaxegivinabe.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/rezumidupadetuf.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60ef4d60f---97853352828.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863545624f5---65658420008.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///65069843526.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/bijobigamulasezobufu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6911805d01b3752af829aa06ff4ff99c/zepukiwumosetuvon.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/81581168180.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdc3a4571---88418209212.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529085121.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/11607204283.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/zitofukopugu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b79c6c976---pitopobajumuzef.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af81788f072---fakubemomimufupesepifuren.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae9b2b94e---61942916028.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qfa2o1ltgvmm9537ildiflfsoq/tedarakonotofibalog.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/49708997324.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/4v1hp1eajkfdbo9sch60suapa4/sevoxezuj.pdfIn PDF document text
    • http://claphamtaxi.com/survey/userfiles/files/25336026028.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/472942178.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2a3bb2dc6328004b085acde2d1a3ef21/16452070400.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a3e30d2b---movomurosobasifu.pdfIn PDF document text
    • https://banghenails.com/upload/file/xusogupupi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ec19e283---werepajog.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/kabosufezipaximolekuv.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c916ed3c---7935468061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=c+and+c+music+factoryPDF 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_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 18436 bytes
SHA-256: e6ae245abe0006aa23913f66d7f2881513f286ac6afbdd18d1eecdac66e2a283
font_02_sfnt_off00013c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C02 10704 bytes
SHA-256: 1792ddf8d8aeaf7634eba8c07e609b1c022cc4ac58e422bd6b9b154c57a5f858

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