Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0330053029989b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 00:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78544cdaa3fb7eb9074d0950249d0289 SHA-1: 7510e83d5aeba8e8e772347ac6d1448b9bf6c53f SHA-256: df0330053029989be086d984ac1a03004ba42383e661adf1874821db2f331525
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

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 http://se-ty.com/uploads/userfiles/file/ziwepugisisugimomegejo.pdf In PDF document text
    • https://ladangmimpi.com/contents/files/97106130946.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/17918632735.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/pulumupirejudetuse.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/bujifolefanedogepaxurida.pdfIn PDF document text
    • https://domilot.com/uploader/files/nexuwowelabowani.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15973853221.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/nudovam.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd86604642---tivefagusefoxejilunof.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/gapufiligibeloba.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/retejegikubefezi.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/55830084055.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/metigeriropuzabugefo.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/datewejedizajap.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/zelopubogixaxugedabekepu.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozimus.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/69455205460.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/jaxazotesew.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/759939124.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d28b414e---29057594389.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0de17422---10640357733.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/redarew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=game+dawn+breakPDF 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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 17812 bytes
SHA-256: b90fc6a3ca3fd445a6f6c485c6ace7e09530f01433f25d6abe3394aece9821c6
font_01_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10244 bytes
SHA-256: bf43053dea8668510e19ca90cdcc20d270a5221cdc208a0e44e1afcde742b322
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1