Malicious PDF — malware analysis report

Static analysis result for SHA-256 43deeb79538f533a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 18:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7c4241464e1d93769ab6ec9dd817f5a SHA-1: 5535541bdf56b6bb17906b1f919dbb06c721ae90 SHA-256: 43deeb79538f533a91e2330cfcf0bfde459ae20423bfc7b39b6cf56c930d703e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing attempt, likely to lure users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://medvor.ru/uplcv?utm_term=how+to+stop+videos+from+automatically+playing+on+chrome PDF link annotation
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xojekujupirob.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/reporumudobofesulavob.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ee10547bcebf9a785184cdb83e7d5429/retaxof.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/zelabedoxidire.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/46685343322.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/nebeluvukumaxopunuso.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/mitidamatezodupite.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/74482193947.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/75885661692.pdfIn PDF document text
    • http://risme.vn/files/44536990869.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/57618910367.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/42852991984.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/61659407466.pdfIn PDF document text
    • http://ahchala.com/img/file/gubevexapuw.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/26163157462.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/51867092533.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/widow.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a6b0a415a45651660389462d3264e327/vifabazuzasadugafaxexe.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/17350541528.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/57587794397.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/75982782045.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/15543075078.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/pugejivavagolojato.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/najaruz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/516b1ac96b33e46fee9a59b530a4f3aa/52876375203.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/somitorivegimekapajadib.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_off0000c574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 17428 bytes
SHA-256: 7c5cfcea6eb3d2e686a2b017545a5d4c0399bf11cf792054f41820f9935508ce
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 11424 bytes
SHA-256: 2132b03beeff8364bca0db5c96743f61d0cd2e8b13f455c2cac2acd181ecd5f3
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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