Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fce98b4b0641d5b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 01:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df0586d3c7fa42aa15c21da3e5328aea SHA-1: 724bcfdd336c55f6ae9236916709eb95c088e353 SHA-256: 9fce98b4b0641d5b3e46197768a9ff09c7c517739e5dfd4260dc5910addcfa51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=hairy+maclary+scattercat+pdf PDF link annotation
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/mirobalufat.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/xiwinareko.pdfIn PDF document text
    • http://riceart.ir/basefile/files/vigazafiwagajajepudub.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca274a59b---57861088635.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/80fde31f093245167f710699b4d8d81c/gevinakutuzevixobixivijom.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6993d3b---87380750992.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b9049eb76---74987514564.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/32f2f64fc0e2e27721f37880a4432ca9/korenagiriwusedegifazeso.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f2bd4b55---malimepufidufekajamojuz.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/32142301486.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/zupav.pdfIn PDF document text
    • https://cncunse.com/d/files/95078940954.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/8452506452.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090511631c6a---73747747546.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d02e7fc7c3c69266630816e7729fb365/40441976947.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/bukarewaji.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/fbfc44d0099facbd3e36effe6692d789/94131907167.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zaburumez.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7146aedfb9---46275631091.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b35ee85a---fevuzawetomef.pdfIn PDF document text
    • http://novichiha.ru/pic/file/65019023537.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/2643379180.pdfIn PDF document text
    • https://micsys.in/userfiles/file/sigusajegurakojerowun.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f6dc31af---dekuda.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/15288109961.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///59235093464.pdfIn PDF document text
    • https://fobh.net/userfiles/files/bomegolaruvisasevezepoge.pdfIn PDF document text
    • 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 17396 bytes
SHA-256: ddb2e7ce0db9afabf0090de52e34c070d0f4f7ea08b00e21ea56db6d3f111a7c
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 10664 bytes
SHA-256: 1a9c6e06c6f69f04da9825fa73830ed9e10601c3ead40327c75df2afee74d9dc

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