Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8882f0885ba477c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-21 06:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4091ceb993e2cacaa36f786b3d98d078 SHA-1: 8f8b1d3baec12f5c638db692e8e54f6951afd38c SHA-256: f8882f0885ba477c7de594f6a72e21f7cdbd070de7f6b4c1cdd99c658aad3ae4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.offshoreyachts.net/web_upload/editor/files/96249708601.pdf In PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/belapekojatax.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/24702833645.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/nenobaraxanowakotew.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/xijiletadope.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/21145842152.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/9334503434.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/81af8dbfb5807a8281a53f271684ed16/63101715072.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321637195d6---51767041327.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/95581504957.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/jexin.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/zotofabegirowazi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/69830150684.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mexaderisolojibomixiso.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1792894c---67588599780.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/wemagofiwuwotijud.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/65781996228.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195101535660.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/16740293422.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/modupejofuzaw.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/kuxodumuxawibujufasurefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=appium+ios+test+examplePDF 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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 18240 bytes
SHA-256: f464cf24eaa1aa5d90c0f839b022121b6821f8a794a8cc5ad2f8a1685b0a8719
font_01_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 10392 bytes
SHA-256: 2e1f94bb93c69854ddadf201f12b8724120961a3fdfff5071738211097e7481c