Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5596c111e5f3338…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e188bef2d5da62f34acd028e73fc28e1 SHA-1: be67b8845b03649391ee7f2b84407fa25dd21e5e SHA-256: a5596c111e5f333898d62468aa399ee9dbb4039a319941945b05a0227a091f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b054dc5be20---35928331251.pdf In PDF document text
    • http://illinoislivestock.org/userfiles/file/18380448427.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/17933601454.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05b6e06fce---5506854902.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/puranadexafabuk.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5286d209b7---zemunarewakiboxedoxiralug.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36aa003fb8---mefenavalazumilemumipoz.pdfIn PDF document text
    • http://abwva.com/uploads/files/49371936228.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127953bdbce4---52404687181.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/84da4b0ff8b6f76ea5e071a8a0146214/juvugumijegeguru.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cf4fa4db33723d6092064a0b8c3f7c19/17212715397.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d4ed66a0---77155632374.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/kupaxus.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/bisuz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e0199480---fosukesalesifemuxune.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca1056bc9---pijepilabeninul.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/31463293568.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3c88734b---nafanube.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/legitopadodemuzagakog.pdfIn PDF document text
    • http://iltorg.ru/upload/file/45654335520.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2733bbeb---23386243159.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaaa57b04f---88304502038.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/52869010754.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/zodopunibupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=arabian+horse+red+dead+redemption+2PDF 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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 10852 bytes
SHA-256: d018280ca3b59107967500114b7e0191ec898e0fdbcc7585542c3f4513891edb
font_01_sfnt_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 15436 bytes
SHA-256: 6238473d7b1db3ee4b38ff36aa618a4a9287bb8363766a8af3747c7229c0d122
font_02_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1