Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e89de64afc70813…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 19:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 981640baba38b11f2e110d0dd0124c05 SHA-1: 8588f64e41d89825606d6106b7257966db94923b SHA-256: 8e89de64afc70813b8305617b1cd8fabcd9390c0926baa8cd1b1c453a1149408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of links, many pointing to compromised CMS upload directories and disposable hosting. This structure strongly suggests a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct phishing. The ML classifier and ClamAV detection further support the malicious nature of this document.

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 https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9221fec21e6c70a2e140496c1f9d7fa5/46926888164.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/86889505351.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5qarkobdho4dpsb6q05ornau2o/lipekojenu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nuxiludaguwave.pdfIn PDF document text
    • http://atomleasing.ru/media/File/662531602.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/658de709e815db6ee41267f18b2731d1/kenizimefalix.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/79245919036.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a054cfc895a---sasum.pdfIn PDF document text
    • http://veljun-ldm.hr/files/fusufajibepirofageniseru.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/56823765431.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582c92fc7f---lesoxodupisapowuxasifomuz.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/xuzamadal.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fanozudavigabisifaro.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a19e4202a---diwiraxasanexadigorofax.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/zemeloj.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/69798984630.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec625c918---satozanolusojitivowoxeb.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/eaaef57963186ae071e92d778806bc63/80516665700.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c91112e88e1e93d48b93b01fe6c69ea1/4895410451.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/21902311879.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ff49b5a055313b01f87c91f8d02494c0/99149251521.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fudolesip.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/59401619292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=arctic+air+freezer+af49+parts+manualPDF 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_off0000c03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03A 16816 bytes
SHA-256: 811444b50acde3ff1201679c9b4c2c26905fc27fc4e93df480db1b10c7fd72a0
font_01_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 10908 bytes
SHA-256: 0f909dc2bd6318fe95e6f04979558bfedbc6120fd2f6964b34d3790a4628478d
font_02_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1