Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4853d33cfa9b7f3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 05:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b084731f1571cdc91070652f939a8867 SHA-1: 398094921af7b1790bcb88fcc151f3e813a3b889 SHA-256: f4853d33cfa9b7f3653fcedefb08579b92bd96ab0ed38858703977281d39709c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and the presence of 'utm_term=download app google play for android' suggests a lure for users seeking applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=download+app+google+play+for+android PDF link annotation
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/91264180502.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/83311060342.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/nolikalupalonumaxo.pdfIn PDF document text
    • https://almavilag.hu/files/files/21653073883.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/22528722370.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/77486414050.pdfIn PDF document text
    • http://888chji.com/userfiles/files/73393522189.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/70612942766.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/81345760016.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/12370726941.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ef1593e1---15966621851.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/65604493333.pdfIn PDF document text
    • https://dcimx.com/files/37764189154.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/98999945720.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tituzewogamotu.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/3013522964.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/mamadawomadefutevoni.pdfIn PDF document text
    • http://jocafoto.com/fotos/file/jesajonoz.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sizilipiwevobamubej.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/95851357127.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137942dd3b92---terexibefugokuwexi.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16423280171.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/lafidejutasubelukozoxi.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/74757079716.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/susulunof.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd21528bc4---96162500558.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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10608 bytes
SHA-256: 2a1fde144853f16e5e6b7d9cfe31d65c51e3bd25166e21d5982d595d09b9a8db
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 15988 bytes
SHA-256: bf62f21706b50603855dbae850dce7a81052414c26524ee31885b2f6467bd1e6

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