Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2752b9c12def753…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 19:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4953bc00aaf0ce88a53887b80eb963d SHA-1: 1922913c7ad435030a7c3ef36b15b72933bd6d8d SHA-256: a2752b9c12def753194468e48d487fe1fd8b9e24985e49221d4b4171614a9235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=easy+coin+master+hack+without+verification PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613497c3d0f4b---57359853413.pdfIn PDF document text
    • http://shesob.com/file/files/bamowotimamoxijidikifefa.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/nariv.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/murezeta.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/45132362064.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vevilixetajotufukafuweju.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bifizovepifavoripoxap.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/88168464899.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4ed5772f---lemoridepafubaru.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/30858016495.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/sapafazajotimetogi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///9033008026.pdfIn PDF document text
    • http://artospace.com/pics/file/dowalik.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/wajiropudijoke.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/sogilolovakibodebak.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/seranilaruxa.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/fopuboxuzolamamolasidelal.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d12e53472---kaziriwobitoramugujigaben.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/4507022140.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/38109387501.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/vijosadixuzifi.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/53802325791.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334fb186934---madikupojurexadew.pdfIn PDF document text
    • https://mlspoland.co/files/file/94089412417.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b844ce03a---kopuxoxetili.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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 18088 bytes
SHA-256: 95ad584399a1a1f0c37d127cb9ea5c04150a09128e6b2f95ffb72525708a28a4
font_02_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 10996 bytes
SHA-256: b45ced44fa57e7a8e34600d151a30110c7be3e9afd07a4568949d3d7044ff627

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