Malicious PDF — malware analysis report

Static analysis result for SHA-256 a258b2c3c7a84c4c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-15 20:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71b3ce5566185a446370ef221874ff57 SHA-1: b0905df7312958424e03d04f4685b9e740522444 SHA-256: a258b2c3c7a84c4c4db03545ec08d1e8e6004282126dbd4a768f140f262050ba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests it's a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://latexindia.com/userfiles/file/nefurovaradej.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7de95ec75788dff72a55c8c1ade80414/doziratagav.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fd679fdf---wadupuratodupira.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/143d476f85ab92b24aa9cfcd60a413d0/27979993583.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/47296545344.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/20133457906.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/biruxefakofazowimapo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ffc9c1f56765e2d2391aca6b2a8dbee5/21750119529.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/33352182835.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/vopiganipufurabexitofa.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/504d9968b4c845b1568bf48a6f174a94/votodaximudazurigediz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3de35d2a6a06d6dd631386b1961a9f08/17949787268.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/gejixag.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b209bd32a8---virokalerugutate.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7b5f1c1dc32ad2d37ddd80f2b9d66aee/82946301862.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/669c2f8e0c93c1bcfcea497465367e0f/sekapazavesagunofini.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6h148ra3ufegt1ondqlugptgg4/30985204633.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tuwofilofavibosapos.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60495aa42---97676002244.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b269b504747---82877741844.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3c1295f0f4b1c86b079a347de9b2c820/nuvadovulivoni.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4969cd225d6a2fd5e9270099f1daf465/pisimopulex.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/mazixezivawasijebas.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9fb930617032ffd29030be23a866fe2c/36007845181.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b11132307fbc5f27e4f15b921de37c63/26725781645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=at+least+probabilityPDF 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_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 20328 bytes
SHA-256: 96746c896c5bf45ca96f201fb53ababa05aa5925ac9b96484eebb202224f5558
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10376 bytes
SHA-256: 0723f1687305d5a2211402f5a72ffed2c9cf616f2da53ef3411a1ea14d253c65
font_02_sfnt_off00013659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1