Malicious PDF — malware analysis report

Static analysis result for SHA-256 526e6812ab08d4e8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 06:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fe99dafd12672b499aba3750c563384 SHA-1: 7837806b28e6a2b2cbe58b611e571e8eb63af440 SHA-256: 526e6812ab08d4e860b84d2c5e36e15a7013595f9ca61d59d3442995c6ccd8ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=manqoos+moulid+pdf PDF link annotation
    • https://vibanghanoi.com/uploads/files/pafixilixibakuleponaferu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bef388f6fbdb6d3ef53216db5ee0e4ca/96879237903.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/rokirurezejimuwumi.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/gegusabasirepejuxiraroxuz.pdfIn PDF document text
    • http://vititanon.com/user_img/files/99638820191.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/38735529394.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb9727bf0---fedelupalobozona.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tihrg242jtk5ac014o6jsmq2hi/surajadofalakifezevexu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/84283018656.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1a4fc8a2aab0e3549ab63a882666cb3d/difotufiku.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/pakiziwasani.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/51331329964.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/oopl91o5cmfu04rl4smghs8095/rupuve.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/dugusaguraz.pdfIn PDF document text
    • https://coluer.ir/documents/file/karutomon.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8d0343dcfcddd986778ac62602a085c9/zirumejanopalenegidob.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086124474695---gipikifovasowegi.pdfIn PDF document text
    • https://memoservicesrl.it/file/vipokafe.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/55573007897.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/dunefikebozu.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/faverufonukijemoj.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612e132a35fd6---lodagivix.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/14866092116.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67278076625.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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 10568 bytes
SHA-256: 8f649b97d889364b6e1d6f1c655f44a80d7649c1bcb7bfb071129d0ac9a7dbf8
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 16796 bytes
SHA-256: 1449349d69292338fa7e77b29bafaee5f803bf02ab4c68afb22e2b45b6a655ca
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1