Malicious PDF — malware analysis report

Static analysis result for SHA-256 609cf1248053c938…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 13:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6ef072a509eddfac4b19d9a0cf61d8d SHA-1: c19b193ce4680f23ba057db5f19ffbfe8e95dce1 SHA-256: 609cf1248053c938faaefc218cf1ff9a58e7623e06cb7bf5ebc31bc3e97889aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=etologia+y+bienestar+animal+pdf PDF link annotation
    • http://nowator-zpu.pl/userfiles/file/gofuwefedojisurevo.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/4553691921.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/pupesomugazefaxowowiraf.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/lekexedanuxo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9a546ed511077d6399356d6e1b2364ad/37228420760.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/19492814040.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bt5sdac9redpab47urfghiog9s/14562041849.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bbfd3edd6180014dcddd155280027132/60119997408.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/xazipukojivogikuru.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937ac1c50d---gusamo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/llj7pe163tfdotufhjhdn6c3d7/55351653814.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/29237031860.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/vilako.pdfIn PDF document text
    • http://guitarenko.fr/img/files/90098557541.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6c47d8e08864ce69f6f0c8a274ded792/pomajudiw.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/15751567942.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/29848655008.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612d28b5d5419---22128674735.pdfIn PDF document text
    • https://adikkedua.com/contents//files/4703397435.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/40753588616.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/filavevigofo.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/87093179929.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4d7f12f2---91815696388.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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 17004 bytes
SHA-256: bffc88885dfc6ca8122ea99b1a48f34ad1b4cb743ae5a75293cd530ba5a2539e
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 11076 bytes
SHA-256: e316c4b0aad69b57da6a5e78cbd1fd5ec746a7707f510251792c3ab2bbf449e8

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