Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b359bdbef8c144…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 17:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7aa09a6d3481548453cbe9e90613ec6a SHA-1: bc1aba26c088604c753d31dae420bd790a70479e SHA-256: e8b359bdbef8c1448377a49df2dd5cf81d3a183111c41dc349dbc0f5492a493b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and other potentially malicious hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • 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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75eb92c---fezuxesumapoladogebutimig.pdf In PDF document text
    • http://torremaggiore.sitmap.it/files/files/rolunepelawelexut.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/50703021061.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/petevedimowejirigepagatoj.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/22919254533.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sosiromu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/523887bf69dee462d29cbcf6f8b55ceb/juxoruduso.pdfIn PDF document text
    • https://goodline.by/userfiles/file/nifesanug.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/dotofoxu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021911112633206.pdfIn PDF document text
    • http://indemo.pl/Image/files/22585111439.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/46339328348.pdfIn PDF document text
    • https://bdata.vn/upload/files/12972676222.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/xonarerebuladerukapuz.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nozogivasi.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/fevemenifudivozedev.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f6d92b5acceb1cd5d77274c65900464e/xijekiwatonevajefupot.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/guvod.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/jugufakizupowigeta.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tufejugo.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/vipizupalarojovinuw.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469226e42db---48595154763.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141914b1086e---fejogagol.pdfIn PDF document text
    • https://cargotavio.ru/files/file/jagozilu.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/venitojoxelesuvukejudal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wonder+woman+tv+series+streamingPDF 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_off0000b407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 15528 bytes
SHA-256: 919b760715778ab6100385968055026c567b59fa33cfde867a56f31d950b6cd9
font_01_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 10692 bytes
SHA-256: b3aa7125c2c5c4dc79efeb90ff5c6c2a96202aea0a4c53eed321cda7ab328780
font_02_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1