Malicious PDF — malware analysis report

Static analysis result for SHA-256 9323b80b70feb86b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 06:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d0d264d6799ac37c78e4ede73bff15a SHA-1: b192b358306d901d48d9f6155cdef64ca289bdce SHA-256: 9323b80b70feb86b8146c853214ac18f1c2569f45cbfed62c56e8cbc47d1e7a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm on disposable hosting and links pointing to compromised CMS uploads, suggesting it's used to redirect users to malicious sites. The PDF structure and link farm indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=abraham+hicks+emotional+scale+pdf PDF link annotation
    • http://an-professional.ru/img/files/file/labonimavav.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9a224c571b3fcb96f961e9a1b75f38a5/tonibuzekigatemuk.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pofegakejobakewurajapa.pdfIn PDF document text
    • http://lecostationery.com/files/file/nazamujupusogokowi.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/lejuxadixopube.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/20188637619.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/vifugazavadaluleduj.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/mubinuxogimu.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/xijezajaso.pdfIn PDF document text
    • http://gnox.vn/upload/files/belikugu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137088c522c5---46187822.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/89490575128.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/72974361351.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5dfe63d9---83036579134.pdfIn PDF document text
    • http://rapet.hu/files/jorozusezajenuwugivuso.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/50739600426.pdfIn PDF document text
    • http://asja.ua/userfiles/file/21537371761.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/83934480618.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/78911858463.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/bokub.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/wepefesamizezikavofawuwu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155db26018---50822049702.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/bazepoxidevuxunikuridu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/walewikapas.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec1f86cbe---68242466676.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/25803736182.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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 11100 bytes
SHA-256: bca5e725a8c3631ffc87e0f27a5427fab349c99da6f61ec2a15e2a256448bd00
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 17680 bytes
SHA-256: 80371f8f2694a267a5c8bdd171d19d6f95a0ad3e6e457736d1266cad72ce3e55
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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