Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ae3b89ec2ef5c2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 21:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c07f0eae37973f78087adeb95f033bf6 SHA-1: b99beb6dffdd690ac79284e1618109d181234f93 SHA-256: b5ae3b89ec2ef5c26e29239597affd75a8969ec8bb792e5083f3e28388e8930a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://szpital-sulecin.pl/images/fckfiles/file/sulol.pdf In PDF document text
    • http://whkmradio.com/userfiles/file/dumafejujapev.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afab71992f---kimebu.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/69434616093.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106dcddac3---gexomekimikasipasefuv.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/35908244141.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131169188b2b---gibezakawegus.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95c1fe984828a296cc7a013d923dcfb7/popabunasaranawamosar.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/bezivifadetutumezoj.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/20011421107.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/gelevizimod.pdfIn PDF document text
    • http://ewtch.com/upload/files/4859282123.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/tiranaperijakipisisu.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/bozipubosedavukoveda.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/pikopakibabutufubixakapu.pdfIn PDF document text
    • https://bawauang.com/contents/files/powizagipo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/gepakananenuf.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/83204793668.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/devawemu.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/64275410531.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dekusaladawobofub.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/74108564051.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/vulosusikaroxutetawinuj.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lejatekegezupenanopesof.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/tetosizeladigedeluxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+my+iphone+contacts+on+my+androidPDF 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_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 11104 bytes
SHA-256: e71b8ea429e3caebd8551409e6a94412f26ee283c90b732ead05ee42e055da96
font_01_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 19716 bytes
SHA-256: 90a36a5225f2d096ed2d3c64d07540ddf2f984456db59876b3f45edfe701e886

Open this report in the interactive analyzer, or submit your own file for analysis.