Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8977ce6724114f7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 14:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99a96d1a5d0f20790a5fee553ff0f905 SHA-1: 1e97d9dc59dfa3e589df4f0075465ea8bcb7e9e3 SHA-256: d8977ce6724114f7b645399f929142837715adc4bbe26f89d84cf354e83a6e1e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with phishing or malware lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=cricket+live+apk+mod PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613292e6be92c---vizilivak.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/28812402153.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/61244926729.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/58946977706.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/87847553967.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/12816371072.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d12d7ad2d---poripad.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/bolijiwobewizi.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/posififasekaxivogevubenud.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/35663616291.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/18302378709.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210902185740.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f1519818e6f77b5e620acdba5491b2b9/19612492369.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/63514186981.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad5c6bbe1---fesulonutabu.pdfIn PDF document text
    • https://il-gusto.com/images/file/12820584062.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/tafikesax.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/75483537081.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161319198aac32---bugudixuxoraris.pdfIn PDF document text
    • http://runo34.ru/attachments/file/15981927739.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133add3af8fb---fufalizonosesi.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/52430770057.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/pusakunanaxale.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/60920144799.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/soxoloxe.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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 17128 bytes
SHA-256: 115b3362f33e37cdf4d4c4b5e6b0813eed61bfe543c07337cb5859c3e7baaf63
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 10592 bytes
SHA-256: 038be7169d772fb3eca5f4388301d19e0dff66d1ab81f14238823a48f01cb0d9