Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd688fe0d373b94…

MALICIOUS

PDF

94.5 KB Created: 2021-08-03 04:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c26d90331f0d1ea2c4f22769594b864 SHA-1: a16098e12d50e10678caf8cb5aa2c3a6b7ac9d1d SHA-256: 9bd688fe0d373b94e6d11f71c5751fc8390c6f01161d47630ee08aeebaa9d47d
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics suggest this PDF is a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the extensive use of malicious links is sufficient to classify this as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=why+won%27t+my+sky+remote+volume+work PDF link annotation
    • http://asustainable.com/global/file/47037604511.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vibalitimejexawedi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abcee5c17---gigevipimi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8062f10d---nukarovu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99404cfcc---zivugijoxakuwitiv.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/sadejofosu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd7298721---foponasogodim.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5c950f2e0e1974f66d2a02bb0fddfc88/54132437766.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/16102564528.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/66982366512.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1a6171da---14592435906.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/sonirugekevanafez.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/nevolawimot.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/99509014879.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/fatirujunowejilowed.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079db5d83593---tivuk.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zuvefitafa.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc8cb4f77---jetiva.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0db3ca330---xewumutelegi.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/ab4873024a1a18d0d8c674181a606b12/68129990631.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/30485020786.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/40224694628.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0a8037d0---zefaxuliseka.pdfIn PDF document text
    • https://fotovipvercelli.it/file/3221257126.pdfIn PDF document text
    • https://teddybestore.it/file/77978083995.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/02ee6e3a529ce817785999c09d39577b/devopixut.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_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 17144 bytes
SHA-256: 6e9ec517a65021ff1902af76c276de10047d8a932d219fdaacfe3382f6934043
font_02_sfnt_off000151d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D8 10604 bytes
SHA-256: 8cb9245e91354687bc8c434594ff5b180b9847b938d3a3ed8c120e79796c3d1f