Malicious PDF — malware analysis report

Static analysis result for SHA-256 142a0716fa6a063e…

MALICIOUS

PDF

91.9 KB Created: 2021-08-14 01:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9ef7e43f3c87334e730db93db20e100 SHA-1: 58cf2badbc7dd34c3364fafaccb48c2d4452dfe9 SHA-256: 142a0716fa6a063e5f1bb96cb9c98a838f05f3700f844de27a023b1767f5ac1d
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts hosting similar content indicates a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160baa840661cc---wubikefomepojuva.pdf In PDF document text
    • http://sovaimm.it/userfiles/files/58533242973.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2e851552dba08ddc68087ce0a2cc4abd/2633863799.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bba0c720082b176e280201a8ed331eb6/55271124457.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e88c88f70---85569393223.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/60671985741.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/runoresuzu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a2f4c0ea---maxixekije.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bba3a87ed9a---jufuxodemetaguv.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/kizaludelomimawekixi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49134d9f3---zogekuv.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/15668755406.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/94e23beedaf14ec27edcaab902ba9672/88944255258.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/54616485173.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ca610c70b2a7369047dd7212a41cfb46/vurumafakaneleren.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lelvlr4ionmtlfb5irua5bgv1h/xepoxipamovapogirezit.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/66584050463.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/papijus.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209a4bd901---piledubufusox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2b51470f11202715092775cbe1595fe2/naraxinogevime.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/jagidedizijexifisogo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2f5851e7da737624a7ba34144a0828e8/fubilegujizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ygs+kimya+konu+anlat%C4%B1m+kitap+pdfPDF 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_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 10944 bytes
SHA-256: e2a309d4e4805aec13c29c1dfe3656dbafe9e36f64fc688c850ef557e5078440
font_02_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 16624 bytes
SHA-256: 563fb143a1fca3cd249cd2bbcd56673d68d5df468e2177a0ece0dd6f2410cdbe