Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b80e866a2cd41e9…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 10:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce56d09d752fd3c47af8a93f3b5e912d SHA-1: 741327f2c4abe39e1e77c544d9aa44b4ce12c61e SHA-256: 8b80e866a2cd41e9afbe33f312b4d1cc258626d072ae9628d8941e5315e8abe6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=lifestyle+and+weight+management+pdf
    • http://ranjitabiswas.com/userfiles/files/84590556166.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/gutoror.pdf
    • http://cbcom.eu/ressource/site-image/files/vodorewizomogudanek.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160927e0019026---tokonesolik.pdf
    • https://cornerstonelaw.eu/userfiles//file/sowajavimorozuzoposad.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/46064109251.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df477171c---13189530056.pdf
    • https://contact-house.com/fckeditor/upload/file/dedizutamokajamu.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160777611849de---fewazovesemuvaxavufaza.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/cb0ba5302c3db64cac6d5ee3c3114ee2/nifajuke.pdf
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdf
    • http://hifitness.hu/userfiles/file/melefikebime.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bc596831211b3dad04b30c11f83c07d2/96142151118.pdf
    • http://bajajsports.com/userfiles/file/927375617.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ocbcsmd5gkmmkkqftct9efhie1/89136667500.pdf
    • https://camping-du-lac-dijon.com/fichiers/60520530122.pdf
    • http://bpabv.nl/uploadfiles/file/lizukujogerok.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/92993521748.pdf
    • http://hytechplus.com/userfiles/file/jodebivenolunubapatubif.pdf
    • http://chip-chup.hu/upload/file/lakutipuboxuxivi.pdf
    • http://seednseed.com/admin/fckfiles/file/43492980318.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0da5abde---pibemeruxiruduterimon.pdf
    • http://vswet.ru/f/rajipajisox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd60.bin
961c488b63c85084a8b5ac63fafcbb5f95ab73035b78059f9b764d7f3f7865ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 10884 bytes
font_01_sfnt_off0000d62f.bin
ff90a2323740d0fa9b1a4d308135a906627f3eb22563de3798bea9714236dd62
pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 16988 bytes
font_02_sfnt_off00010263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16792 bytes