Malicious PDF — malware analysis report

Static analysis result for SHA-256 2544912e42e154de…

MALICIOUS

PDF

73.4 KB Created: 2021-10-08 17:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3e1968573e5d92ec7cf401ea6799175 SHA-1: 54eafe42be11c7ebdd07270666cf6a3bcada7d3d SHA-256: 2544912e42e154de89dac56190867de1e2cf0c2a1c1dd7dca97f463ffadf2eaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains, suggesting a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=double+angle+trig+identities+worksheet PDF link annotation
    • https://satybharat.com/ci/userfiles/files/pisidi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/pajiv.pdfIn PDF document text
    • http://www.grifin.sk/files/tiveweramosolefa.pdfIn PDF document text
    • https://uudanbury.life/files/file/lumosebil.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/61855232895.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/xapabukotuvimo.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/nukidilas.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/voxafumub.pdfIn PDF document text
    • http://rinsacars.com/files/others/xumodubapolowirobazefi.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/78464210459.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/84253574698.pdfIn PDF document text
    • http://haphadoor.com/upload/files/movisukebemewa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323791be0d3---lesiwusenefax.pdfIn PDF document text
    • http://hzhuacui.com/images/upload/File/69919323790.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/woziravapudifulinipe.pdfIn PDF document text
    • https://ibextrail.com/editor-images/piretur.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/98276150332.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/xubulesonidenas.pdfIn PDF document text
    • https://0900107678.com/upload/file/jusezug.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/83983289023.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614939ffaa2d6---nanopa.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/vepuxonulowipudixoda.pdfIn PDF document text
    • http://kite-surf.sk/files/xekuweko.pdfIn PDF document text
    • http://cartopack.be/Images/file/kijewabi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161574a688b58e---44708996682.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/wukorixujatebefelo.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_off0000bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 10944 bytes
SHA-256: 6f90e18a42f886bb529faeb65fa002f5d1a7715ef66e0706275b68fc0a1ddb23
font_02_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16624 bytes
SHA-256: ded100736a27a7a7bca87ec0ebefd6e438600d80cfe5f8910fe958e04e34d0ea

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