Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c92977a8d3f6bca…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 10:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c892fa0765657da90d15e010dab9f2a SHA-1: dccd0a306e61b80d22d295f92683424281803df8 SHA-256: 1c92977a8d3f6bcade5b328611a25713860dc5919d1d11eee93abfd96f4d66f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc20af5ec---1480226542.pdf In PDF document text
    • https://protrialse.eu/files/files/bizotaxowafuwikug.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/wavonisozafolivesamigaga.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/68115133404.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/80860422999.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cb13bbc7---jepifaxujagekug.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/76447974106.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/xukelowasebezoxevoj.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/zanitomumobowug.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/fb73fc6e97ca8747d888b0b3da81d7bf/petujokuxusirefeve.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/voxetonozibaf.pdfIn PDF document text
    • http://ipceurope.be/assets/file/12537512539.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/86864021609.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614c99a037782---61239932008.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/sovifupepevisomijidakada.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/koxunokaxexumenezamovo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dexawe.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/60334101281.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/894432979.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/rujufagunokofonobatujo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/14844101496.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xowipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=national+day+ofPDF 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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 10040 bytes
SHA-256: 105cbf4516b4768ed2c7b1bdf6ec74e091bb7569279b5c193cbacdc28375e4c0
font_02_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16128 bytes
SHA-256: be220fe372ddaf8311ce4efe533577991d6d175d7a6a9f0711dfd77896a42a4c