Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5cb2bbb84d3841…

MALICIOUS

PDF

80.7 KB Created: 2021-08-31 09:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9610d54d6affc498a5cd47ea02cfdd79 SHA-1: d0b26b475dad9af5f748921931a97059e2a8e3cf SHA-256: 2c5cb2bbb84d38414a19ffcb9651732edb95589ebc1265bccdf3d99336d29acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=arkup+houseboat+price PDF link annotation
    • http://stringquartet.biz/web/images/fck/file/19637573571.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/knkkrohhgt601in3vi3l0c7rt7/87474440302.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/vororun.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/68655381460.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/naxukutorawuder.pdfIn PDF document text
    • http://gestioniarmatoriali.it/84764739350.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/birorodejifadudexavuzu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wefegikarika.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b843f8f18a1---kilazijejalalonedemu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683c91d100---5347653745.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/rewevitovebuxefiwidimute.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2b5008e0a27b7fab2f48b2646841a448/lajuxuna.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/puzazaparojuviwupasulo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607616625f706---94186966187.pdfIn PDF document text
    • http://billsky.ee/files/file/dekoriz.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/ronupopadifi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lomalovi.pdfIn PDF document text
    • http://isgsrl.it/images/file/82740461885.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zozitinutonosobemuraxile.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/436540b4db2f3c61c5ace2e78e6c8e52/xukajivisiramoromenutufu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607402e89e7c3---futukafogovadibus.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/pevozaruge.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8728dc00313de33f1c50695f60729170/motufeg.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 17368 bytes
SHA-256: e5d42555fa2764faf8f7e1e385b6db595469611cefd948c6659a385bc761a332
font_01_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 10636 bytes
SHA-256: a0a94a832b9da7a4510d2671b9fa984103535dcc02eab4d26e9251c9c5884c78

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