Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0413e6d610e86f3…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73a6fb628babb5ed123cbef9d845810e SHA-1: b464088654109ddedcb09f3cf4cf4f88e5ab76cc SHA-256: b0413e6d610e86f3dab3df81b388207c754ca3a10e19f85b6d4a25a90c99c6b7
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=ipad+pro+12+price+in+pakistan PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9cf8102bd8bb442e516e96834ab0ee2d/33262957081.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/jozinalot.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161346e08e3836---guverisofojibatorupe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/20439313207.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/19642727754.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fagipiwefefuki.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/21712722229.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109090503064073.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/6856295029.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/sisozenenoj.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/devilatevixu.pdfIn PDF document text
    • https://partnermind.cz/images/files/sokapizabubemenofuba.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/10810365492.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210920_142253.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a41a05db---ribawa.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/xonimuwuxonaxa.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kizojax.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/73125528572.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/14059759145.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/renotukibonabafalazabut.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a18166af561ca5fa8f7cf8ec2efc9926/xofurimivuma.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/14155197475.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sixegepagora.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/jovimisejoz.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/lilapomowolidulovo.pdfIn PDF document text
    • 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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 19892 bytes
SHA-256: 45b4ff50484da57bc25a500b58df0fb51a006e4a788f7e60ab23d892972a5d53
font_01_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 10676 bytes
SHA-256: 82afd2266559a844b2fad48353bf355a81bed8bf6fa5616de96e624ff999962e
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1