Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1ba81fb045615d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 13:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97c40050642791099aadba212a20b038 SHA-1: 22bd5800ea9cc8e37041e5f5a4640138ee225c69 SHA-256: 0a1ba81fb045615dba26a8429903c36c903b820c1f8df2f4e6792f58217fb781
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=dance+maths+typing PDF link annotation
    • http://frutapacargentina.com/ckfinder/userfiles/files/mavegaxilijuxozajifojo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f635b52f08---15056673886.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/59893272501.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/71960725087.pdfIn PDF document text
    • https://yifff.se/userfiles/file/xafijozarefepem.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/73030226442.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/daveme.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/35112913423.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/tevamorif.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/67943609719.pdfIn PDF document text
    • http://aquatherm-graz.at/files/11425591857.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/73863032340.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/nevararip.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jimas.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/fakofawewub.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5decffd0---56143572908.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/27909949250.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/65200936615.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16131350cccffc---53589110097.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/11965415371.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121ece593---33976666575.pdfIn PDF document text
    • https://argumentua.com/i/file/bavezud.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/beni729pqu8dc27tiuult1f61m/pukofejitipabotinug.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/fusavowuvolafuxezewirag.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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 10668 bytes
SHA-256: a7cee816c9907d0e3772b04262bf078084839fb887741310771b6f7644f8b05f
font_01_sfnt_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16736 bytes
SHA-256: 99ca47b1317cf16d3563e5029dfcc7568e73de8646d9bee0dae9c3e063fe8458