Malicious PDF — malware analysis report

Static analysis result for SHA-256 048f2ea7f66560d2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 12:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c7d70ad65744c44dc5c3f9a1967bb85 SHA-1: 729a40464d795c94fef0202f24097c459de1e3d5 SHA-256: 048f2ea7f66560d251383a751bf97d63be2f11aa85f9ce7a610c9454fcd73d7e
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS platforms, suggesting an attempt to lure users to malicious or compromised sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=le+grand+albert+grimoire+pdf PDF link annotation
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/betasilubolupabobanoxadik.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pagasukaxeze.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/xozisavidimiv.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/23948321446.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/33836421056.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wabepunubefepi.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/32936612963.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/mozazemutupoxiviwobeboji.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2ac2ccbc329777a7da394aa3aea12a1b/mibutujowaxuwut.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/19186545898.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/buvobujesumoxegunot.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/popegifijulijagitu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365010f2296---23508609761.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090208465251.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nomizi.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/kejol.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a096df85a---tikufapupe.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/bifupijonamatub.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/16788369909.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/bulilupimopulodarewer.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/88399137998.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zuzejorafuxidivobebane.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lenuzitixo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/55146782107.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/30207630641.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/kunirinugoxokevajasimi.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_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 19456 bytes
SHA-256: 03d4b13fd1916e8900a434e635cda76f11c5068401dadf043e2098f9fdcda9be
font_01_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 10768 bytes
SHA-256: cc7446adc255566a6329737e731de78ab4bd3ef344c2884ed64163ee9ed41705
font_02_sfnt_off00012d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1