Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1c0a3d42c1312a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 22:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ba0977edfd5b15f413caed9465b9fd3 SHA-1: 2789890e60af385931be6def81fd91fe3b93add4 SHA-256: fa1c0a3d42c1312afa3723a3ea9f52a0aaf14aacbc31069f9f32a7cd69388028
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=brawl+stars+chaos+mod+apk PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e005117f---90005457099.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/mizupuv.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e26feb18d54c2f9bf9bc26ee471ddc98/baremojebimijesusogoza.pdfIn PDF document text
    • https://satesayap.com/contents/files/44412620702.pdfIn PDF document text
    • http://www.og2c.com/images/file/1047768405.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/nanazigeviju.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/40235246631.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/15848979914.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b524925ffd10d228bda20b1d476405a4/69383983572.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d4fe15da9---kudabulawobejuvuxedos.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/pevutubusebin.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/makigufalo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d5528a081139d8392c929698f4f68bc4/kukisekoxaxuduzo.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/xofulud.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j3f127l4kvu7hd33e8f9dig0qc/tusepakitekukoza.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/42689397270.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/jevukuzawusedef.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/febizilebaxebodox.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/jusafugugir.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/ronokoladagoguwet.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/75660637759.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210906094607.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/selamowapixef.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/45686075725.pdfIn PDF document text
    • http://honghuibio.com/d/files/faduduzuno.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161462588022ee---54252835520.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_off0000bcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10684 bytes
SHA-256: e324d24cd3f6757186d3f7ee3571d03fdef5e37ec9e99468e1f38c9fb61a57c3
font_02_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 16240 bytes
SHA-256: 2ebe70eb9701b8cc0249e121b205106ae21df7bc2afcf0e141f638b100e8d1e6

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