Malicious PDF — malware analysis report

Static analysis result for SHA-256 f141c6c87ac01f94…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 17:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c275c283f18129b4137e8a543bc08f8d SHA-1: 46fcd51f6df8045a980723953ff7eb3c394d8201 SHA-256: f141c6c87ac01f949bcd156a048f03e1db4e27f5e6358598c584cb475efe6089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/15693466534.pdf In PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/e68f6e2f7286348bb1d56653b3901570/kujogogadenira.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/bevalibativujoju.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oaitoq0urg7lg7tlb6hshop11n/lirazivujazuze.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/29187633337.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/9984192474.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210529092248.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2cef2fec---buxafuzazus.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/89977272892.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tfc0l89o7h19b94ttf0916olfn/24632193762.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/2523221531.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/vexefavizakefapakubalap.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/46549918889.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff86fdb607---tosikudori.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766690eed77---kokagukerek.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gl6un97ag9bmssm27tlo3p5cos/23491097536.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zoxokoxeboxizegurupegufe.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/715b063f5605bdeebbca98c2c370c511/wewutijuvesovipowe.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/71276432331.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083621a66e11---tosugotisobewukikokaxi.pdfIn PDF document text
    • http://chinalabware.net/d/files/gurapati.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160925f1ad5bff---63204921315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=home+gym+workout+routines+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e8074e34---xugatesixusibidisek.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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 11016 bytes
SHA-256: 55dcb86ab5a498517b08d14146b7b036b7ca43052d263c464f9eb20e3e2da489
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16784 bytes
SHA-256: 9f1e3f593eb4e92bad91488d39c1106ad69bd658a31bc779c083fbd4eedaada8
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1