Malicious PDF — malware analysis report

Static analysis result for SHA-256 5219bab35c376d4a…

MALICIOUS

PDF

76.7 KB Created: 2021-07-09 11:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8b2b418b9877a2be70c62f0d4734637e SHA-1: fcd2f9f45078b08d3865beaea1b24543db4c3c09 SHA-256: 5219bab35c376d4a9071840cc7655112a3ff0d5ed6222fba4bbce09fa9ec588d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or malware distribution vector. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests an attempt to obscure the true destination or host malicious content. The document's structure and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://short-story.ru/upload/file/56890332826.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/tefegasidotabiluwareze.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/39652726303.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/domakovizoziwoda.pdfIn PDF document text
    • http://kasargod.net/uploads/file/90712725708.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b05b95c3a---5597123107.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-23/20210523102859120797.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4997b021---86228070648.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607042307aac6---lasakaverasuzibevizesa.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/39259089733.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4d37118650264ffbb092fddc5c6b1684/14804428464.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/33845319198.pdfIn PDF document text
    • http://medi-sen.com/files/files/boledemipidafelazij.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/44122132819.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/banejakirubujejexajiju.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501100918132.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/038923bc98c2c285560317f5a031c33a/36480653349.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535c26628---25334843744.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/80283273617.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/faeidgbuto9f959fs5b27qjahq/wofozidekuposubutakamalaf.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/81286132606.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d45ca4a2---fiwavolaseliju.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ah91jq0cl5cfmt7lk0qkvgh19o/43696251842.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7836eb91a---11478885794.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/valolakononifajor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=understanding+options+2e+pdf+free+downloadPDF 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_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 16036 bytes
SHA-256: 2fcec28ffee6e82af8dbd6bdd2ece5625469a2187c05233ea017ff6376f0a5e2
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 10888 bytes
SHA-256: d6a7088f5f3bb346d625c67115019b6efb5dbc11f717e121ad958ac194c513e4

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