Malicious PDF — malware analysis report

Static analysis result for SHA-256 662e51a1dd84ec93…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 12:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2e604c711f07b7608ec5d292c9a36f2 SHA-1: 1ce679df5de998e9a21b9afb5d72c74aa3f051c7 SHA-256: 662e51a1dd84ec93db21d617a834622578fbe89e2008221189abd4af80d122d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa514f5f6---xofimi.pdf In PDF document text
    • http://tochuchoinghi.org/files/xakibilakewiripe.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/pijimegejomawadi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f433491704---lejaxavawujajawose.pdfIn PDF document text
    • http://ipublicity.cz/data/file/zobupixutad.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8ff3fe9ca0b46d08852be467681ae2fc/lewawumelababevabobafobi.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/pederawe.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/33597417448.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4b53eea8---rizupivenuzuxarevukosix.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/27389810633.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xirumujebeka.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/78224560161.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/disevelevakodovuxixexab.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/sanoxovosotopefuseg.pdfIn PDF document text
    • https://bnovum.hu/downloads/zugotuman.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/22930591107.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5da8b0a14aa373e6aa258df6ac0e7bed/33608763209.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vanowowunepovenox.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/nufazalak.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/27770891937.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/veriwepanamokigokopali.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765fd76613---vilexi.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/ruwowesinusozipepug.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/nuwikeferaxagofurudofoda.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/gogox.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tebijuzalokomurapajow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=just+friends+putlockerPDF 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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 18060 bytes
SHA-256: 2c7fc4c7f0072c04debebcf008bf64efcc3d6b5d70cd8fcf91d93ea49a1344e3
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 10632 bytes
SHA-256: 071ae151d3a79ad6ecaec1d531bf96fecc19533f9a2b179abb1e2d597f6220bd

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