Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaddbb04dec47fa…

MALICIOUS

PDF

76.5 KB Created: 2021-07-26 22:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 025c509278d26f9396aa412445b2d2f5 SHA-1: a4b5da8948d760474a690ca15b4d68981f52bb71 SHA-256: ffaddbb04dec47fa82bf28e25844926ae68447edd1557f06d01bcaf504b36ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dansecyr.ca/pdf/file/vijumes.pdf In PDF document text
    • https://rumusjitu.com/contents//files/rinobiwabota.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/35155370957.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67207318835.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/wufidifu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab80e72925---viwiloribuvul.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65625a71b3---kamidezexesosufofuxejasoz.pdfIn PDF document text
    • http://hotstamping.pl/files/file/27655433858.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609704741cf36---xijogiboditisawudobunoku.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/demavisulizesosuwa.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607017b78041d---xenoxusipeduk.pdfIn PDF document text
    • http://vhktn.at/images/content/files/viravumajetilo.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/44916742128.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c8262e4f045beb04b317c4f373ec8aec/kusadodo.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/texujajetemokemovil.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/67655516757.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae99d1a7d95---punijizaditiledesa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd867a24f1a---tabaxajarapalomo.pdfIn PDF document text
    • http://apsons.eu/files/file/62233902876.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/lovekivuvuvalis.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5bd684078---gagukugoraregiwapud.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/266912bf5ad9abed9cc35bcc0a786cc3/91772744225.pdfIn PDF document text
    • http://blatt-gruen.ch/files/15300250388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=street+law+workbook+answer+keyPDF 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_off0000c4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10516 bytes
SHA-256: a052170acbda448c72b9c56b193ed2ce523cc5e1907d8a6f50fbf931023729a1
font_02_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 17740 bytes
SHA-256: c6b2ec455057a204db0fd4ff7dae0917c37de58f402e1326a546954b756569ab

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