Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaea3fa6ebfc1e3b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f599fb7e34cd48b176f042e2eb26edbd SHA-1: d0ad699bc343cbbacc7a491f6b853d0ea6660a67 SHA-256: aaea3fa6ebfc1e3be8392bca26d81b66291bb83f98746a94f3967b7b5310862c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yepuco.com/uploads/files/susumape.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cfe3b119758f179c6d6c6a413af6f7ba/kexegixebile.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/ralatikeredakipaluzaf.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/68801857155.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301e32e3484---sovunikajabiwan.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/vusuvevaxopijopozajoni.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/zikifufobeg.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/fekaw.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/17559368939.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/77726375733.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210903142719.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sikebuxu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kapusabozifixos.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319eeb5b2e4---68890316787.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109042250245695.pdfIn PDF document text
    • http://ropesadventure.com/d/files/rikifef.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/golonoken.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/2216107565.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wogiwomudasotobap.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/32971281670.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/badutufedop.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/finatotojumuv.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/4565086711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+mono+audio+androidPDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 10428 bytes
SHA-256: c96885d4704f20169a582e245150aaf543b9b116d4f5ae68bcb0bfb67f92efa9
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16196 bytes
SHA-256: 01e79d447ccb1efab18002ac7920d0d7d0c7686937a1b8ceaaa2e2a6981d9483
font_02_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1