Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab3f9e5ef3a237d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 02:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a779ee66fdf9fdac42431688af515ddc SHA-1: 53ca4e34e4f98324dd4443a68831069b94e87d3a SHA-256: bab3f9e5ef3a237dbb53209eaf632fe198ca721495f6cace135ab464501a7d21
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or spam campaign. The ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=roman+fran%C3%A7ais+pdf+gratuit PDF link annotation
    • http://hitecds.com/userfiles/file/fifijuwa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b7d8e712b---bawubolidutatowep.pdfIn PDF document text
    • http://imi.vc/upload/files/39715688631.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f8e795b85499b4fac78ae1323a447de6/bijegef.pdfIn PDF document text
    • https://il-gusto.com/images/file/gajipajozetag.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3947a351774ce3b02d3c8819615e643d/33737140323.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/vovodipubuzobaxezolubirab.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/gogix.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/31200266717.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d76b3c2e6---zavukanenijabuvuvoxabak.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/wokofaserozenutovu.pdfIn PDF document text
    • http://letdentalab.com/img/files/9626209394.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kotimusunetuxizugekakizup.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/pekofowukinef.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2522b4bd6---44604796206.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/51856603878.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8e26adc1fd2df87c933cf4689929dddb/xotadugokumozumenuzi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1811f37bf---87065727335.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/paxiwikisuxa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/791643c14ec6c2bbb0bdc6256cca7d66/towejubevuzuw.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/dupupekevi.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/naxakinexujifisaxakobaj.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/39306357287.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/sipexujepeputepitafepanet.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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 18752 bytes
SHA-256: c5bb122c9a31efae68ddb29a955af57e442b32f7072c6e5ec1f8cf59228e2f53
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 11004 bytes
SHA-256: 1c2d3e8b26e3e18aedb04125e8d3115125b64da51b8d5cf24b65b522075d14f7

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