Malicious PDF — malware analysis report

Static analysis result for SHA-256 a812e95b7c7e2f6d…

MALICIOUS

PDF

85.6 KB Created: 2021-10-10 05:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31c180cbc28a48d47844f05a72013780 SHA-1: 9d5b0a0b6632343eb801fb780623d6411b4c1100 SHA-256: a812e95b7c7e2f6dcf5758b5a41e3ecad3e24efa89302f87a41014a0ca6fedf0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, directing users to various domains, some of which are compromised or disposable. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://evenements.gipso.org/ckfinder/userfiles/files/89246521700.pdf In PDF document text
    • http://uk-finansist.ru/userfiles/file/83453430858.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/fewuxunot.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/xijatul.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/bufefuwilivinukezabekuso.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/32187033117.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wevulogu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed0065deb2---xulusolifaminofugas.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/63361894803.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/96968918274.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161557c2adeb3b---videsugu.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/nojoxakujuzobiperewolin.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/emj2krt7up2aqq2l1eq7763t9e/volutefoge.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/vegixeremiwedepari.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/53172508024.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/43315257971.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/83515473351.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc618a3cc---wunile.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/95836436174.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tewelubizo.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/76584344136.pdfIn PDF document text
    • http://wdnederland.nl/file/lupukiguwinow.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/83749254804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=early+stage+ringworm+on+facePDF 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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 17424 bytes
SHA-256: 670d5e32a41f86c22dd711649db90058e1c26c6cb2afaa57e9c618015e81e130
font_01_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 10864 bytes
SHA-256: ad6e7bddf80cab15ecc0ff066650e6625c85c0080f49a7e4370fc8545f2ab242

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