Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbac4b2a7031b26…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 18:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a42aa1158a7fe303077103ce7189caf0 SHA-1: e254526fb24598bb13b8739c95acb2809f245845 SHA-256: abbac4b2a7031b26e564892a032a17664afc52778c0b437e6fc2809436d818ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=financial+management+ebook PDF link annotation
    • http://istihdamhaberleri.com/upload/ckfinder/files/25084248902.pdfIn PDF document text
    • http://sparkpro.lv/content/file/91529229553.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/barikulebigerigefave.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/faninosefezi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132e1eb2d4b9---kedusi.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/33548813745.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/bonitofi.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/95623161580.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/vaxaberaruzunulifasoxoj.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb4c3adbc---51628231183.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/belamuwisibigo.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/25422237514.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/7663588252.pdfIn PDF document text
    • http://indexone.ru/upload/file/8324919763.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/92226475336.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/58771840797.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mevikoxulazobejurita.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/jusitibunodunulutegikef.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090522453273499.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/wemejow.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/geravovolabobejo.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210902210913.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/muralipababamimefoxujavox.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/62972205232.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e28877f234cf64d0c8e67071a32116b0/83867868172.pdfIn PDF document text
    • 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_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 17276 bytes
SHA-256: d0c5ed027b59d5095ae3d45700794b70cc9ce22befddbe384e9b8c3c12c3f7bc
font_02_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10512 bytes
SHA-256: 02a5e7f69ae71e87081f4e799532278aaa82d920d291434b89e1102cd4b05d37

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