Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be48ab2deddb52f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-30 11:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d4801e839be5a49289a1d5ced43bd79 SHA-1: ab6a5184530190aab874885f19155a31dc2bd4da SHA-256: 8be48ab2deddb52f9a70cc8a356a6502cef1c42671148d3d782cf1915363da70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=comparative+and+superlative+adjectives+lesson+plan+pdf PDF link annotation
    • http://dtmaso.com/public_html/Imagens/file/9725562135.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142606d601c0---kimesepixaginavat.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615564892005d---beniduvonebanonok.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/93984431571.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/sinapusenud.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210917101248_1868419891.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/fiwoxowivajusisugawuva.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/18408679995.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/57791979540.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906161122.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/fumupepesudot.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rokflhal1m1j1mug26hobk4i9o/72314955814.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/62954480345.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/27962541513.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/jarupewufubozafajago.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/sofurawofunilexaf.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/jidigigudono.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/wulapirumimesi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/1729972729.pdfIn PDF document text
    • http://watch62.ru/files/files/jekap.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/geresetadapeguxusi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137858845b51---4461542874.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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 17072 bytes
SHA-256: 75ce03efed6085c3ed1e0119ed2e0006636285f6e6d9d4f1b01750eba0ccbd38
font_01_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 11108 bytes
SHA-256: 859c9afb235d8649458814e664ee69d122bdd6263fceda74e1050c5d0123d007
font_02_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1