Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fbb761fb7e939e…

MALICIOUS

PDF

76.1 KB Created: 2021-07-23 05:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df7f4b6a635424e4721a64de31e53592 SHA-1: b444b2a48d14951dff0cc095ca0387877e75875d SHA-256: 91fbb761fb7e939ecd79395b0f61b35ca796e2235cc320c7c74f4ef1f8b0a988
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or scam attempt, as indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of numerous links to potentially compromised websites. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the document's structure and embedded links suggest it is designed to direct users to malicious content or facilitate fraudulent interactions, likely as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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) 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://jnnycc.org/userfiles/file/zopamazegakanebumun.pdf In PDF document text
    • https://mfdesign.hu/files/file/68407066701.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/94321b38a15f0d4d7e119793b4ffe3fd/gorunijusibare.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pfv806qb8vkf39h66bt4ai8qlo/vewumejogasiwutowawelun.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qhs5u84ho9vf3fv6rap9a38ulp/72972959071.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/57487910001.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lqrg1439ls8p058e8jnk3l0iv8/10589795646.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ina7d7lspecbpodpe9lk4ko3t1/27457653530.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/zaledaxuwanunilagene.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/53519030344.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/71243873732.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/ruvatixipovaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3be9e570daf9bfadfdd29556c63b21cf/lufazagumikuvu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u4ocmqmf7d9ftabj5jnaug3jbd/63054166938.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lexomoranosoketavixeroz.pdfIn PDF document text
    • http://w-mill.jp/images/file/ragigu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/15389899496.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/lalaxeve.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/94341305504.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/visikofugibasirugogegim.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ehf9shufni1e0am9gpig4djd3b/38632017144.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/rozodeluner.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1o1tsaon360kn7upfqc32s1l92/gurefidevorepagukogafuta.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/76428072308.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f9ded9a2e---21500689576.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/fubiwasiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=motels+in+newington+ctPDF 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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 16512 bytes
SHA-256: 4ee7dba9f734c6430ef0d012fac6ae2f9d8fd0722eb6c23a091a9b946effba18
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 10220 bytes
SHA-256: 6f97f1eda407658de1e627e812feb43b81f3569b0cdfeead8e735dd33dc80c16
font_02_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1