Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e63695848a8d0d6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 04:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c4d34c4ed98848d376c1fbed8ea593e SHA-1: 0003acd877a44ddf375ce3dc8aa0fd6d2944ee61 SHA-256: 1e63695848a8d0d6d16a9b4bbbbead3eb60574e472fe8c0010faf0c23da34930
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF is identified as a link farm on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ikuv4kd56qpappkbhndd5v01fo/4817475923.pdf In PDF document text
    • http://drentmedischadvies.nl/uploads/files/52766130366.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/vedosasiwabeguxupod.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/36007156967.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/56553849428.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gnictitddtbiknhbnpk50l00er/55292141742.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/68239300411.pdfIn PDF document text
    • http://podarox.ru/public/files/21766161771.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/vupiwimubulokebagumi.pdfIn PDF document text
    • https://abss.pt/userfiles/file/toxoxu.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/tebonujirunapivirifatut.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jevelokolisezepujoxif.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/dofabirimivuru.pdfIn PDF document text
    • http://cissi.it/userfiles/files/81392495977.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109060348348514.pdfIn PDF document text
    • https://kaisar168.com/contents/files/gagufotewuvakovita.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/33049431544.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e474f4a317---34293019816.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/fesubabafopowo.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/71933621721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=target+sdk+29PDF 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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 18416 bytes
SHA-256: a637014bdc19868ebfb4b8638a6460253c06f583d72a44409f28534651caad48
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 10404 bytes
SHA-256: f2ef15c25ef66829918a9a09cd69586d9df802cf29aeac840944406d623c7f05