Malicious PDF — malware analysis report

Static analysis result for SHA-256 8745b9ca1ddc5a21…

MALICIOUS

PDF

238.4 KB Created: 2021-07-08 16:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85a1c8bf1682b21c854faf64e52beb3c SHA-1: d7fe9662e32dcd00029277d033fc03f6dfb829b2 SHA-256: 8745b9ca1ddc5a21e95e48d025da3f39f27b5c14c6694aea522b6ec54eb64972
134 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 exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9622

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://toyotaprius-custom.com/js/upload/files/17907643844.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e5ec4400d6c155662b741964ee8c19b/60737577058.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/64851700413.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/99066001848.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3802ee48---kivanizimug.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210619_89B6CD877C20A436.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609254dd9833b---rabolubexevefaludit.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nevudipupunivipuxe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a8ba755f2025a2533893b7933d63fea1/xeraguva.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/29177306974.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c820423ab3750973da38a6096f17f9b3/donuridufajiba.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9ea9a7b5---gevaloxozinekedek.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a3339d9920f269d65dd6591fb74cfe9f/feduridumazi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa06701d8---jefugerapigaselivavuw.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/tunimapufet.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4kn42u5fvlrtr2tdt23gi0dhp/21340515578.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/nugufereninirisizowomev.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/mageperitenozegesugojexaj.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d62b49e41---fusebixomo.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/mofuketerizazavirogivaxod.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6fb17ac04---8803528160.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a7939a7ce4aefe97c9691c7d8d8f3777/86715157714.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f9d5282232188dca9704100730b22e5d/jesukobovipuxuwowe.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/qj9d7drbp8r20qc498of19po2c/81950107316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=severson+and+smeadPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/kosuvasitobazefer.pdfIn PDF document text
    • 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_off00034c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34C12 18588 bytes
SHA-256: 29e546bb59a52698a96e1ab0866c8670d26c12d05f2e5deeeabd42a05a0a99dd
font_01_sfnt_off00037dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37DD0 10316 bytes
SHA-256: e835a46492ed75268ed0a46695ffc9406104cbd25e45ae31762c84bc49284195
font_02_sfnt_off00039512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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