Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4cf91d1255ead1…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 22:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79ca82172c9be2077d868b1a72e05a99 SHA-1: a4c140cf3213b09bf886358b5f15fde536460433 SHA-256: 9f4cf91d1255ead1b159bfa0d48e98a70efd90751b3efb73f98a57f631e4b6f6
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading and executing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://monyetjoget.com/contents/files/dugipugewaximigizefuf.pdf In PDF document text
    • https://eseninternational.com/uploads/files/31824246061.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/28333236503.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/19034512469.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae04f3d576b---goboxujujizab.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/60672851635.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/753fff6e1847fb5d36fee083475dac15/58672364122.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zesakujuvipija.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/35421584866.pdfIn PDF document text
    • http://tms-operation.com/upload/files/wolevumeziropagar.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe14276525e07a75d359745ea15c1a7a/wumasudarototewujiji.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/rinunetoditukasugotasutex.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/buxolifetaso.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a57355a58da0232aec930f46c722e02a/suvokepufikevapedeti.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/wasalusuzedipurexasef.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba57d6a97---luwisokale.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109020520076704.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/39820036467.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/kepopozitezufitadu.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/kimidifexuzeg.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202171434482396.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/36275937731.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tmbpvs47npivvn72brcng0q7u3/zuforefanasukibed.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/vijavotizobinepusikowimov.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4d7000ecd4bca85eace6ae5b0b845463/56691120050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=descargar+formulario+210+dian+2018+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_off0000bf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 11468 bytes
SHA-256: f5b7b9b2fcea3cbb5cafee60f52aa6ee9eea72ba30857b6b7c9035138ada04a3
font_01_sfnt_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 17816 bytes
SHA-256: d330ff9e5951d402774bc121e1468e59b4303d4cfa1ba01d8d683617d2f0848d
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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