Malicious PDF — malware analysis report

Static analysis result for SHA-256 9846703180f72ab8…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 15:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ec4fc1b1fe162d736fe573cc5636ed1 SHA-1: 7fe1546837fb4339ec8e4682185a44fbdf428880 SHA-256: 9846703180f72ab8a37a3c7b8da93d521edf9a19580b57c7b9e9abdc10ca6313
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://webaprint.be/img/file/rewulotam.pdf In PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/sinulem.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/47218736540.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/52850067101.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/mivalusatigakazafonekapip.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/toser.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15dc0ab168---18499266178.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/jazupakakudavapisuged.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/vodewazizofebuporituta.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/76791574001.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831022b2ee0---63806224014.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977871cd885---81470148397.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/6538719443.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/9p7hgqppqrmf74sfklssl3re6s/28122491292.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/kuduwepez.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/wifozimama.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/wonemijozoxotuz.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/43449800956.pdfIn PDF document text
    • https://factinet.com/uploads/files/zipofelowararat.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/111182979.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132568123093---lezitajami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=federal+cassation+decision+volume+23+pdfPDF 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_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 11216 bytes
SHA-256: 0111666084c0befe1fc4b2fca9cb57119c80c09f595c3dcc197900d2516ddf78
font_02_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 19404 bytes
SHA-256: 6c22bffd763f144d4b5a10a1839fb0f7dc67a9b55f9b0ae2d7d4d107ec8dafd4