Malicious PDF — malware analysis report

Static analysis result for SHA-256 0308d73628ee7c24…

MALICIOUS

PDF

96.0 KB Created: 2021-09-16 05:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ae5211bc4490067c87c4dead595a741 SHA-1: ba153c27f3de150d7ea5975138c1a52d895d9b4b SHA-256: 0308d73628ee7c24279d828ad35a7bee8cca183a4a618e7f4bd9306666c15ee9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites and disposable domains, suggesting an attempt to lure users to malicious content. The PDF structure and embedded URIs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=how+to+get+free+followers+in+instagram+2020 PDF link annotation
    • https://kop-trans.pl/uploads/userfiles/files/dafibefagivurepuma.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1b894111---21582892831.pdfIn PDF document text
    • http://effektfilm.de/files/file/88586033665.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142a62c2d366---65129749275.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/15264950056.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373710e71af---47302789466.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/texemikatukejafuro.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/81356897571.pdfIn PDF document text
    • http://rooptex.com/uploads/12746247307.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613718ee92f90---26755091538.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d9a33cba6249687a1c2e38358addccfc/fujizurazegedij.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/86076968813.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/66613877998.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a846578---51902485137.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/lovetegogofuraked.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/zipumitegofamoxazulalew.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/5420156661.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zolubil.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317ab1ef678---65077746666.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce39280f15---jovik.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/dajutimexipiwegu.pdfIn PDF document text
    • http://master-vin.ru/files/file/88902131074.pdfIn PDF document text
    • http://bdsductri.com/upload/files/wodogowexu.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/rudelitexijanotofitebe.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/tileve.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_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 18416 bytes
SHA-256: ddf4e9119cf52fc59766831a2b373d413f006000a2f4845816e761975e01f1b3
font_01_sfnt_off000140b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C8 10876 bytes
SHA-256: dcfd8c8edc4323f2de9a56c2e7712d0fe1df527756c949a636e6ed74de9d0c31

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