Malicious PDF — malware analysis report

Static analysis result for SHA-256 5952ba4bc067bb5c…

MALICIOUS

PDF

92.3 KB Created: 2021-08-06 10:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f666eb07121423cc91746a84b4d3c1a5 SHA-1: 6783e692e5c2de814cf2c14f7408a147e54207a0 SHA-256: 5952ba4bc067bb5ce3c9b0dbd5dc59314e943cc3787dd6d60d7c816ffa17b62c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery mechanism. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 https://smidgel.ru/uplcv?utm_term=ejemplos+de+aplicaciones+de+funciones+exponenciales+en+la+vida+cotidiana PDF link annotation
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e5dc29cf586b683a28813fe5473ba883/tekewukumirata.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fgrbjtntg2e7s3jjckh968nsml/47641270884.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081322558201---zigagiwikatin.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/69868996187.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e40e073d---49210254686.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/34570914391.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/jinufekexebu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac483e3db71---bafakoxigumogubonir.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/532620741.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13c7aa5f58---kuzewisorijilimamafusu.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/86385262715.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021626547302448.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/tirexederureres.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/37a8b7786bf9c33eff40c2ae163343fa/98673396315.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096c4b6464f1---tumukozokapijekebixuza.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2pq7prihk00vo2klt6pkep6s97/67062366575.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/q5dhtq5tuaq16t376nq618dgqo/zilafexagu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/47986993640.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd86918d80---76141348707.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vepepatig.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/44946803600.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qg9q032i6itfhvdj8b0vctp1f2/67298978067.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ff81a55b---67679245983.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160838b0811f3a---39032532725.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/56264433687.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4e89e9357c971f7606225095ab1dd675/vetij.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa14033fef9---68760721232.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_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 18724 bytes
SHA-256: 95d900995d31c16eaa6e3ababd05ff7322f0711d644c82977d5514893307903d
font_01_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 11064 bytes
SHA-256: f8eae36bf762ac2042d5305c277f29ced6e49aa41fe2e27231f4f207a6a9f290
font_02_sfnt_off000146f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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