Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b85beb98670573…

MALICIOUS

PDF

102.3 KB Created: 2021-08-08 12:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f16630f06d3e13d3a8bf987a5f136da4 SHA-1: 5e5483c9dd1a40bd353689c842fca4642b162e31 SHA-256: d1b85beb986705731b80525ddcf9bec7bb111058622be4037e64455b6fe09c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://henri-ruch.ch/doc_pub/file/donaposude.pdf In PDF document text
    • http://sjhrz.com/images/upload/File/53876987740.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/aa1r1v747km200isivt1rus27s/68028843703.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/66838434715.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kunirosojoxewilituri.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/posoruzix.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d3a3a63b---kipilirebudesuzexusisuz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0c8c208d---75614096688.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/80812294536.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e3a5b1a4c0909e61498b757f326bb18/mipevad.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k5q3haak27iu1pausnn2k94cc3/tosur.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b52b1cb1c---7787132914.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/4002650888.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/82629953497.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802c2a349d---92944627221.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/84829597789.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646e546294---86821199564.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f71d142ab57---furobi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ce9257ea---25340353071.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nubimu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/31o453qk8j22q3bo6k98d9484f/xetim.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202185728179683.pdfIn PDF document text
    • http://builderall.info/userfiles/file/banimeku.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jelorofu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d1626ab1a94d967ecbc80ab8edfd8ad6/80530641994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=m%C3%A9todo+simplex+minimizar+ejercicios+resueltos+paso+a+pasoPDF 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_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 19276 bytes
SHA-256: 75437cf946c9527894909e242cb6f9b48271143041fdb3c82aec63ae83f644f5
font_01_sfnt_off0001564a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564A 11212 bytes
SHA-256: b93f5e2a4d1911369074c95dad69b53ee9b586eb44ee92c8b15b258a4fd47ddd
font_02_sfnt_off00017044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1