Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e05353d48a2a151…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 10:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e820be1d3cc1de7478216f3389be8e3 SHA-1: f0634ded51715ec44dfc69ed7be521f12691cbf1 SHA-256: 1e05353d48a2a151591590b909206abac909f5a3cb4ae7c192966e0a97ad6b20
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload directories or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lensprovn.com/ckfinder/userfiles/files/29862581585.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4546b8adf---fakanazorazetowejifu.pdfIn PDF document text
    • https://efnnma.org/files/file/tarawizufabiwunaramenuza.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/lufefifujekipujemijatuwu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/92cb88bf6359f92b135ff3ebb6da9454/dazakozinoj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jek2ldiuja6sjtteesr1h1jau3/67398186612.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/90774101790.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/59477130411.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jevujidemisaxofa.pdfIn PDF document text
    • http://strandedtattoo.info/file/vogorumumojalere.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/86989204882.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa60e5d6e3---lolapesokilane.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kaxirikowa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9394932538---vaxuwedafatuxogotamemezo.pdfIn PDF document text
    • http://chicopharm.com/upload/files/82427834862.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/15735917586.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e521682d---15692278409.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cr7g9p4qec2s55g3pdghbksj8h/bigidi.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rujiwezesulajamopipasafa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a10847e594927a7286be7102ba94448c/75800864391.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0cda6bba---saruwemorinezux.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60800a28c9---96569009309.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/luxekukanil.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/soxofoneguwikadipoluverux.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/vanijoxedotazozixeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+monthly+budget+planner+worksheetPDF 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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 17244 bytes
SHA-256: 53db688ed896b959616e7a9a01a9a170d0dd5a450e52d6818b294d50b53b630d
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 11256 bytes
SHA-256: 182e2d8ffb84bcee9d9034a205d1b1e978f384725d4137d09fc39c3b58835bcd
font_02_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1