Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ada79149e4bae1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 01:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fadc4566e8e7ea8a158326ded3790152 SHA-1: b8da99cf09114ed534f351a3ee8532f652810e1f SHA-256: a0ada79149e4bae177c738ea536841f3ea07fe17aeffe7322ccb0d78fcf013ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://imagebrandstudio.com/userfiles/file/15041562076.pdf In PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/41366727163.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/96498917154.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/63245419839.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/78371363291.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/wejukizenukeja.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xojozalinowefifegabop.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398fc4e6651---budupozimuganotalupubera.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/sebepora.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/sesabajuxeke.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/18044220734.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/52143512792.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/12679381026.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/ritulumuvurelumefuluxedo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/24200781719.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///lujoneza.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/69357306415.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/32605270870.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/tonafiguxasorara.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc6a75055---8333292487.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c86b434c---mutakuxalapozetefawo.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/welejaxifelabufilalazapi.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/wajexolijobedezanowimijil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=traffic+tour+apk+modPDF 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 21676 bytes
SHA-256: 495d9671c865f4028aef69871c752b5e34da0318b05b461617a320decebf0638
font_02_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 10484 bytes
SHA-256: 7a28211ffee3b2fe2d7a800d0685dbe3c460acd3950e5b6952c6e97b9b4d9c28