Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e40e2e3498ee51f…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 03:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c00743dc4e93d656dbad44f6bba1c4d4 SHA-1: ef4f05edacc9b2737ee5cbc8aa569e3388acd017 SHA-256: 1e40e2e3498ee51fd953a9dd2873cc293da35377659ad968aa7b024c3ff589c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://a2designbg.com/userfiles/file/84591898744.pdf In PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f64e75a6---niganiramogiki.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c506468e7---rezenunogezitagikisenir.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2985be0c5b28b9513fa51ad521f60032/7132578685.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/601a4ca32de56e53fc04e8d402ee6ac7/83860867923.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/64302896672.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/dukululuxax.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/58a22786daeaa9d521a65e8db5296e9d.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab00901dc1---8460813841.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca969ebd9---37647167822.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/tagumefamuf.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3bba8e29---wusin.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ee587d7b97ddd7b0e8ee507949133fd/fijomagatodigoxi.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/1a67ce7e4300c02d68f0a43d6a6b5162.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/71684063220.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/novezilajuvu.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/91968794603.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/hsijlp2377nvl6mc6rfclfquj0/48006365142.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adabf8cea2c---74413895816.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/152a893ce5ed56eec3cdda697472cd41/vivixofotawukenidetotofid.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/23703805589.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrljc3oe8k5r839u01bnfinrc4/68012028294.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zuxemiguduwo.pdfIn PDF document text
    • https://saam.vn/images/content/file/pikexixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=enfoque+historico+cultural+en+el+proceso+de+ense%C3%B1anza+aprendizaje+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_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 11344 bytes
SHA-256: c3c2a1e0280472b055bc17ceee1d2c197a817ba15235ae5818fe335483167ffb
font_01_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 19216 bytes
SHA-256: 37f93c9c09e0f6bc6d10ef5389f772ce95bb77670d9db5be707586c14359bf8a
font_02_sfnt_off000148fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1