Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dd61072a0ce230…

MALICIOUS

PDF

89.3 KB Created: 2021-09-21 16:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f779d552785534c1c2ed21e1f17e4284 SHA-1: d88366c8c4c3dd5b1f6890978664cc69d3a3b60a SHA-256: 90dd61072a0ce2304f5b05b93eb1e0dd7f051f09f76ce9c930364aeed67eae14
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://araratmebel.ru/img/file/6367125884.pdf In PDF document text
    • http://xinshifm.com/userfiles/file/lusisajejitewodo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6249a7523---muwumigitajole.pdfIn PDF document text
    • http://lactopad.com/uploads/files/lodaruvumasa.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/37147455493.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcb283c49---dizuka.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/13430901389.pdfIn PDF document text
    • http://profstil.az/userfiles/file/92910175091.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387d8ccce90---97289238946.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xazano.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613659233e1d3---josuxer.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/jitoxexinomifikorejom.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vijatopumiboxopera.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/jolaxekedose.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c8ce3d154---20564205035.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/46259885425.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/90190210117.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/forifojediwujatabapuxepi.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/buzuzojewewidikejobixo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a33038409---wuwofitakabadobubipo.pdfIn PDF document text
    • https://areicon.com/images/file/sodumuxijijipozupepoz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143db6a931be---52462083384.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_19_05_51_02_7911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=itextsharp+pdf+to+excelPDF 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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10576 bytes
SHA-256: 70f3e59e78b6d3919266858372fd14c6783276fc27294ad76cee7efd560b1e60
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 23884 bytes
SHA-256: 5d8c9a6c60e452daeb93a5de5b536d46ed2da9298b2ffdf911db6257c56a56fc

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