Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35fb7ec68675366…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 14:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cabac6d37dcc5d3db9b8904f6f08a859 SHA-1: 7136f1707b3dc270f8e356380744548fc88f3cec SHA-256: b35fb7ec68675366e7106c1d081fb365cfa90cb53b177825edd7e98e1d3645e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the presence of numerous unknown URLs suggests the document's primary function is to facilitate access to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b39745aa9---84767035724.pdf In PDF document text
    • http://thevisionkharj.com/userfiles/files/33666456273.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/dovifejizi.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109050019005443.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/wumasisara.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/37174487591.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/31714707097.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wemabujoxufo.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/65285445514.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wiledexakevo.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/mokokuguvugoboberuwita.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/jabuxatu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/77009340835.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/75928941266.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/tezixal.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9cdf39569---wotamuni.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/12213753899.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/12245907679.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/68882048435.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210910_073215.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/govoxurojofirowegilisajo.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/57289357659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mha+season+1+dubPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/691b6c0936698ccded9b98769453056b/wipusasete.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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 10292 bytes
SHA-256: 9ebf41fad444633ab8aee3df4219c01cd4082372b07e9f3ec4ebcc9d06d8d45a
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 18556 bytes
SHA-256: 15a14aca23445a49f227897302cd52698f77b1b64795413b8ce07ccfdf33fce2