Malicious PDF — malware analysis report

Static analysis result for SHA-256 451b590717ed8922…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 08:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d66f14e7b7899545d03f9a2802de7418 SHA-1: e17fb99fe93b87ad29c25b81508b0abe6ba5146f SHA-256: 451b590717ed89224a1d23b07cd4d49724aa4a57f9f476208e094d23f5e71560
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV heuristic strongly indicate maliciousness, likely for phishing or malware distribution. The file's structure and numerous external links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c217615c288---lulaxibufuvaxer.pdf In PDF document text
    • http://donghobaoan.com/uploads/files/91233609775.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/83b2d590486ef38b05cec476deedd068/mixam.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4a0aed40---80314528173.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0cb424bc53b13039dbb923bd1a9d619c/perozimofexasexoli.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/76522975366.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/pozopuz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ccf096c8e---dixosajof.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/85018559570.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/rugapasefesuwi.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/74745729280.pdfIn PDF document text
    • http://tortugafilms.ca/adminfiles/file/juwigasubezowolerolap.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/22364016522.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e7821fa29ee200343aa8fb0cf4990151/92936256842.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d660aa3abd---69389958983.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/gebepekafa.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021080723451873499.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/be04e39c80e6e90051e28e12ba8dc072/81714589928.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/1964853737.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/batodasuribatoxegiwofo.pdfIn PDF document text
    • http://artospace.com/pics/file/45970194000.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89aa94f6a4---bakegugowavonulofoviwuki.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2124aee7---xijizer.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/79852112335.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/vufunazinogojedavasa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/jt46c21ijrmr8le1fa80qcoq5s/13509358385.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/67939551356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rusted+cast+iron+grillPDF 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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 17356 bytes
SHA-256: 76dd9d0a2dc46d7f569d8005475b4942f4e5f93822a91890cd9eb8c80baacf78
font_01_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 10692 bytes
SHA-256: 33d22184d52ca9f718cc466197ab6eef6b79c52dca090c220703d9f50bd702e9