Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeddf09ea730fdbd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 01:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0f7204769e2ac5c3baf5360830bb8e4 SHA-1: 3621419136383cb6bc76340c8f97c505cf0ad2cc SHA-256: aeddf09ea730fdbd0ff75dcfcc3086e7f5f2753078126852b60d3839cf375dde
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.groupementpecheduloir.com/ckfinder/userfiles/files/nerixekogapuzomatevonu.pdf In PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/makivivesefurilosunawefa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa3202e4d---xamimokovutotem.pdfIn PDF document text
    • http://northcity.rs/slike/files/sutujufikowutizopoza.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/34ca207396f4a7af2c9221569219b94a/46307322030.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaxebefufafubexalamiviko.pdfIn PDF document text
    • https://afayl.com/userfiles/file/75692532233.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/silisex.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zelumodixonawet.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/xopafozalupunuf.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105261405.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/79396419513.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/58988889032.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/bonelanokokipabulabu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160771d7176568---78109615761.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/eqbg2m5l52quj4699hfqmmhdeo/pewemunagetoboz.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0d90ea91---73670874206.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nimikipixenodakipunimol.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/maxobeviwowedoguzatomuwej.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/rupafuzewixuza.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf3e9066a---paluseparipubukiwi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7fed9c2c03d2abd3873abf266bbddb68/56658616077.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xemibeletagijiruruse.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/95671724194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=caracteristicas+de+la+literatura+latinoamericana+contemporanea+pdfPDF 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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 10912 bytes
SHA-256: 8aab38097e4e1c22f36d963ab6b33ef44fbae117a0e315f104655f622d581566
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 19516 bytes
SHA-256: 76b81cfd66cd2beb8bfa0e4fcc1f19f28e301119c2ce3d97fe1463bfafbd5bf4
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1