Malicious PDF — malware analysis report

Static analysis result for SHA-256 e151f8ae80b28d37…

MALICIOUS

PDF

86.8 KB Created: 2021-07-21 05:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cded222263ff98a51a8bd6aa46291e0 SHA-1: af778f6315a33602124d60b83f6d2cffdb0c950d SHA-256: e151f8ae80b28d37a6acfec45b6d30ed405342d5a5d30451366bb5ce9d0c3e71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://yuanjen.com/ckfinder/userfiles/files/vejudolinezapurur.pdf In PDF document text
    • http://ufnk.fr/app/webroot/files/file/91284978975.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a840570566d---sonomoruvaratevewavesuj.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a7e6ef6f13fe5cbd3a639da9393ff818/jipodujaxixexu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fumojudip.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607805943823d---guzegujebogabopasumozifox.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/83640401043.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/22074750479.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/doparo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ac0deb2f3d9cc792ac956fffdccfefe/83456498489.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/t9q28dnnogghiqlr4he28me588/jewivugatajikawejex.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/65819839208.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d313f16322f0c14c3cf4e35baf61a0e9/vumemumusuxazufafo.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/siniv.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609401754a302---ropomusajajaxawa.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/mofefebenug.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5295733a---napajanosokedutu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/84587357642.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s03v3d62jg1qm0qs760g0gv4ej/36474220093.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/xisurega.pdfIn PDF document text
    • http://fields-on-earth.com/53885874301.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba990bff---74088911417.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090759245c74---42719371654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+music+for+imovie+on+macPDF 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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10880 bytes
SHA-256: 210dc8a003207bce26a5bf16431225b434d4f8de3b00f8bb3400b1692d16f8c1
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 17292 bytes
SHA-256: 2d9b9e79b061c3959193910ddef1182167e3094bb8ac0161457d3578a26ee0f1