Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee731fd9cafd31e7…

MALICIOUS

PDF

218.9 KB Created: 2021-09-16 00:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b73726055b09eb75bd265539441cf4a6 SHA-1: 87d723cea77e36ddfb75a4b43e37ef61d3c1bc56 SHA-256: ee731fd9cafd31e7931b711100ca1f3bb5ee233c41a56d5721f13e585516a631
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

Heuristics 5

  • 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.
  • 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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/240e903917db34a803d4644b3be7fd9a/48878722143.pdf In PDF document text
    • https://tyko.pl/userfiles/file/79212189457.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/nijenoliruwugogini.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/29219627894.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021504064753.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/99769367535.pdfIn PDF document text
    • https://thietbigas.net/media/files/zuwagofulisos.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7ef2caf4---suxexinupevedut.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/zadeterorasigeduf.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/vajatijinuwet.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/69962092030.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/15368977026.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120616591597.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141765c4f1db---7125893276.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/28322785342.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/vogamotipawulalop.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/98552975859.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/woxibozop.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/10917066167.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/08239a8fc2015f74e418b013dd193556/48889329569.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379c057216b---nekudafuribokolaw.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210905075612.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/73193ea427eae9261f9d8a94e29b884f/24143037376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+night+train+at+deoli+ebook+downloadPDF 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_off0002f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00030f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F5B 10640 bytes
SHA-256: 400a6be03885aa40be40816abaa38a4466b197cd21be49553996421a10ae7b82
font_02_sfnt_off00032770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32770 20844 bytes
SHA-256: e2577f3f113d276c79d8995be60ee90d07fd0964ea9759a7d73fcf4c3c1a772c