Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5c5ddb40cf24d0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 21:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8129dd0c45896b7c5dc3d051a9bc08b9 SHA-1: 62222a2e28217ac6639d57e29c2c6dcce2678841 SHA-256: 1a5c5ddb40cf24d0ec161fe0ba9fa86181c9cdb8e308735c6d6d3e392632fdbf
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on potentially compromised websites, indicating a link farm or redirection scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be intended to trick users into downloading an archive, possibly for malicious purposes. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://b2cexpressdemo.com/userfiles/file/webolenup.pdf In PDF document text
    • https://emenu.hu/editor_up/gipitokuwaze.pdfIn PDF document text
    • http://kes.org/upload/editor/files/85928405694.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/44284853227.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614516263492a---62470037170.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/59756514086.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/wojujenojaze.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/ziketatori.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/sogojo.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210918125312.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/raxogonemupegunuver.pdfIn PDF document text
    • http://myphamasia.net/upload/files/48382040364.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/riwuk.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/83764395572.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414aebd5ac0---sakakevuvowogojiwipe.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d08fb3f551ac61850f1cc258615b6b2b/tatasepovagadew.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bada2ef122---fupet.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/varizununitajipozu.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/vixitunaxemisubagolefasu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sg8p8tl9mus1ec9ngvp3rjkljq/sadijajirogoxilo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/58f466f81a6dd028c7c493d56d4ab951/duvedozu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bomuzogikuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=god+of+war+ghost+of+sparta+highly+compressed+isoPDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 17140 bytes
SHA-256: 886d2402d76c43d465c44f7d0314bd81186f5eebb44780fa7d5a46c325804ca6
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 11204 bytes
SHA-256: e7f4842960be7d138cdaa49fd91b2bad78afd0928d43cd2b99f6c57a3a38730b

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