Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8529996a721ad14…

MALICIOUS

PDF

99.0 KB Created: 2021-08-11 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fe5f4545b1931b9f6e88cb76100ad60 SHA-1: a967ce712280524dde18565ab4836debd0ee7aa2 SHA-256: f8529996a721ad146e9ace912b717d3a8deeac07c35ed3f567b15b85964f9de7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs are designed to lead users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=las+venas+abiertas+de+america+latina+resumen+del+capitulo+1 PDF link annotation
    • https://anfauglir.com/images/file/pegokaxizazatekadajofuve.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4680be9f43---xerunukagaranowuvugeli.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/333107859b7ce36f61eaad0e42ada858/58235397966.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5e51ff9a2db5a96f89acbd5c795ca1aa/segururipafuvudofifawabek.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d5e9fd3d---27748714117.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c2016320e---31260457352.pdfIn PDF document text
    • http://synowka.pl/galeria/file/46018036649.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/paserexuxumasukadub.pdfIn PDF document text
    • https://tavio.ru/files/file/22175759471.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39746402315.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/ronizi.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/tebeni.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/84900095206.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e96374b47c52e67726ff5face7a3b650/85553350135.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/32471405070.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5e86fdf8---55605160176.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/93683243881.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ur6doump4qf3mvnintq2um4jq6/golefuvaxe.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d843793f7c---67466631676.pdfIn PDF document text
    • https://aksusu.com/upload/files/gosinuwokifiluma.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885e43435c---gotanafekebaxaxuxivizis.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/79286529545.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/fomajevojon.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/lakimutuluzezogesolat.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/binubinetiro.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_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 10992 bytes
SHA-256: bba81e95cfb0bdf325c560e451ad1da4c6d39405ee71d94cb975e8a6576c5ea3
font_01_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 18592 bytes
SHA-256: 789154a331e6845a6f8ba1833a932d7f020b3da19a7d520317b576853d62431b
font_02_sfnt_off00016263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1