Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b9caed6ccdf2dc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 05:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a18c983041a246526c0540ac2ab82457 SHA-1: d646ebc6695b9f42a69e5fac64ef689295a11e92 SHA-256: 34b9caed6ccdf2dc0de3a4e853f513cfaddfc63dd15d36cba1ac651d328f3a63
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 disposable hosting or compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=social+studies+comprehension+worksheets+4th+grade PDF link annotation
    • http://szzxwx.com/Upload/Upload/file/2021623354592787.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/sudoxojupu.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/71004279801.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/voretulu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sizadowinunos.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052518153873499.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607563584bae2---biwomijitobugepi.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/supeferegowipuz.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/63617743174.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/68567820714.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0028641961ab02be78338fe53e723a71/97521416208.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/lelug.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160944ca927f4d---werokugotavenidija.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/zidekukesumajefuzeb.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92c926f80---zujojuniberafasesa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/62970624912.pdfIn PDF document text
    • http://samtekelektrik.com/files/wazadegujovux.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48c9d7ed7a---43628402772.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/24397862505.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/lalosifen.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/3086844975.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/41756811861.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9286338ba5---5095588515.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fbf533f96---93240296769.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ng53vjhd8cq0co3o3amjh09p25/81461832766.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16124cf3ce9cfe---10882123436.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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 11392 bytes
SHA-256: b72d5a60061d4295a3f1800cc4e6f7c03b8ad28ad2eff1ca0c1cbaa198df7181
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 16896 bytes
SHA-256: a369358f319e6fc0d2a96689bc5b8a138ce4c04c89d1864d38ec1e5471b3080a

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