Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82e86b4cea7115f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 23:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74690a110ae9b205f63a492d14061263 SHA-1: e2b09fb4aab4cca4c073ca1d6a890da39df60767 SHA-256: b82e86b4cea7115fcb83bd8035eef93f11f95e9098819b51e376b80c7f046b93
156 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 compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=robux+hack+2017 PDF link annotation
    • http://agro-partner.com/Image/files/66632613228.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9035519ff---zopoxowizunevo.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/satoninuw.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/8421811542.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/sijodajixekituk.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/38353338571.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/vagugupajuzavuwikan.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/wurudoxulo.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/jajalago.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/25746633a7210d2dc679ffe8288d3549/7270902563.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/60803591646.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/4432671769.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/rogegulom.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rgjovjvbtd9dn3uqkioqbn77lu/86699612283.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/98520906952.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/50046174540.pdfIn PDF document text
    • https://senfina.top/uploads/files/wuzanuvezekolu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/japek.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/93345334073.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/27007279676.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/gosetizu.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/tinaturukamapalaragukus.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t7vgbcpncj4r8lvr78ht0k2slb/sibizozefefafazi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/wufewigeziz.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/ximepo.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/58946593820.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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 14912 bytes
SHA-256: 1a4d8d823b0edc3904e0e33821ac829d8bb8914b6dba8dc7ed0d8bb6e1b658af
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10408 bytes
SHA-256: 86c22f159f12497c5cf3ae9f1397ef7026c9e6aeec9e6364205de7c922a422a2