Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bcd4e508b8cc7c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6311c0b38c20c683cbf0ac6144f5ef63 SHA-1: aedd533d361b82ba6af42d79daa531ce4733157b SHA-256: 94bcd4e508b8cc7c44ac10ce638cb55e4da56b3155159a4c9947e0c2f3959c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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 https://allytemp.ru/uplcv?utm_term=lodi+dynasty+pdf PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709e7864a45---belojokonujanakedibaka.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/denufuxediwodobax.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/9704dea8ebe8828ba53d4362c4741f62/nubigenuru.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5c74c9ce425fa3ffc8155b9960b9ea4f/winexazogakepugaxegejebi.pdfIn PDF document text
    • https://digiconelectronics.com/media/59783117581.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/10112599353.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/52849159183.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/79835436610.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608764bf73222---24721532592.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/66746766284.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/70952053744.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/megebuketezizujifapebifip.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf0235883---24526022335.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bbe915d3331d4b943dbef98ee2b11380/suwufuxewatobalomejedo.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/lezutifi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kazifitiledug.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bbdd39df2ed8a144164be53a14c43630/80147465071.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/13787785674.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fobilepawipega.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/nijupagavomiposixu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4add0701a6f691f574987921e25eb6d3/tiruwoxanezazabowunuz.pdfIn PDF document text
    • http://evola.it/userfiles/files/piwikojulanonogosasivalo.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_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 10284 bytes
SHA-256: 4b9f00344f250790e55f74a2c377940ec4f2a0a6554e7a66e07ec290f3e1d41b
font_01_sfnt_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 21148 bytes
SHA-256: ad4dd36bdbc1cfe9e27e5e5f3c0db7e76eb43ba593190babfcda6038c625d7dc
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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