Malicious PDF — malware analysis report

Static analysis result for SHA-256 9704b2a910b4acd0…

MALICIOUS

PDF

92.4 KB Created: 2021-09-04 06:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 196323b2a84c5771fa697d062ed7b721 SHA-1: b4be60ceabbd48f4586641080d909edf7f050c31 SHA-256: 9704b2a910b4acd0a23df73aa49ffc5567b8f1cff946081df298367ae9ecf0f9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd4c0ac3d---dinagovanegarakifiz.pdf In PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/jegafadovoboduwikubafinow.pdfIn PDF document text
    • https://norservis.info/files/files/97639012588.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/pizokejev.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/tubovu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vabirelo.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/pobuna.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc55d32dd1b---lokix.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jigetagu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839834b2513---59335555483.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/0410qj8228cpcn5ofqrub4qvo6/kukoxedux.pdfIn PDF document text
    • https://posh.hr/files/19455967059.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xidowodavodudif.pdfIn PDF document text
    • https://mar3ol.com/Files/files/17817337697.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/fujofuvirunubasiroworiz.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/dimejetegaduxudafi.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/dupumagofobibupeko.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb0f18736d---23032594545.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/48952799392.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/walovex.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d9f028dcca---tonobapeboni.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fujixagu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607454601461e---jiworogunanapudagumo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/atreab93o4s0sh0i0kd41rrql8/59945779738.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/60957063259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=know+thyself+book+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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 22544 bytes
SHA-256: faf17cb1b91369c7bb2e3aa2bf522ff6182bda9fe2097e30a670e51164ed5f87
font_01_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 10664 bytes
SHA-256: a3465851a081e5e04a8a2b0ded2ebfd39c5f2e5d3f3bdb80bf432db5f87f6770
font_02_sfnt_off00014b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1