Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e2ddfe76c1f87d…

MALICIOUS

PDF

101.2 KB Created: 2021-07-16 05:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 05b85d9f159cdd9ec671f583ab4fccc7 SHA-1: b1521bd94227ca8ccc1646c7428ebcb41028a961 SHA-256: 55e2ddfe76c1f87d8147e5ac4901334ce5caf666fb086998f5ddc9b37580a305
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it functions as a link farm designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://allseasonsart.com/uploads/fck_uploads/file/16153652426.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b707ed084c---86077699075.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1e0e074f---30751882042.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d761f0cbc---69459259770.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/gegamokilijamowiko.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/7807811414.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9289c98927---63965926367.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4c4ae38d---bedenuf.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160766bb8b8a3b---71495098847.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/17446686285.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b564ed7a192---fixibimuvi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/829b760e4ef7b4bf9f05654309ad5047/72799001846.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-23/20210623062434697353.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/95380807488.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nimofujegenaxitaxila.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/u01dgja5m1ji7fm7cm4emeb2b8/tigodojenivom.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608193ce8ae59---39309070576.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f577b26b7---27140066494.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/27231497590.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/31005652211.pdfIn PDF document text
    • http://altinay-law.com/images/file/xesuges.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tuguzimeditetivusovubuv.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e934a436639---bifabuwofafonedigefile.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jevexopoxutovo.pdfIn PDF document text
    • http://candientuvibra.com/images/file/bizuvanufufulugubumunuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=magone+blogger+template+downloadPDF link annotation
    • 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_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14111 17000 bytes
SHA-256: 3fdee5656e53b72712c98a816fc111e322869e339520f73f8dedb75ce5f0660d
font_02_sfnt_off00016daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAA 10696 bytes
SHA-256: 5bbaa66bc76bef85d52eaaa9822d71d8104eb643a5dbdae1031ebe8ae06cee79