Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae08c40d3c53088…

MALICIOUS

PDF

82.0 KB Created: 2021-10-18 04:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c09da5af3af2f02d7b5da689a4c15a79 SHA-1: 3a885c60f1ab775641e7af6b819d0b9d727ee33b SHA-256: bae08c40d3c53088033995d35f87500a658186fd3b165201bfa6e9eea2a40e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.icf-plant.com/files/file/74939088635.pdf In PDF document text
    • http://kleinschadenexpert.com/userfiles/file/woganidupom.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/79900361865.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/31701712755.pdfIn PDF document text
    • http://intertribo.sk/files/98724098940.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/fulad.pdfIn PDF document text
    • http://mosjob.ru/images/file/41490819165.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20211008_114521.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/jowazerolunet.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109040926075308.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/63206715059.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/sanigesimareno.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/24314354256.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/52c6f60c406dab6390580aa2d4089723/jijijekamomexoti.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/39618719736.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/95764926929.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2faf1df9d1e240d155e0fdb6ef6a2ca1/85226255876.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16156389d0c911---kobekibibubavipomefiti.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mqknm9tn288gva70g1pi2h29n0/negivuxifinululu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c775d102c---18840864575.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/jatodez.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/rujazosogurejixuruzo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=google+interview+questions+with+answersPDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 18652 bytes
SHA-256: c3dce7105fcd44143ce5da1843d0a1d0b6c29a00103b489f8209c8f8eccdf683
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 10824 bytes
SHA-256: 558aaa0169944448eb935dbff3bfd99ad5a4d1949c9f7590600441a03b8df6dd