Malicious PDF — malware analysis report

Static analysis result for SHA-256 596c8926033b311d…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 04:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d7e363a74a0c4704d0f60aeb42e535e SHA-1: c158e463f4aff1edeab1d4f30be8acbc497d3a8d SHA-256: 596c8926033b311dba78f87d5c1693e80e7b7b3f593bef0b1b051ce7e971fc19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The presence of multiple external URIs and a link farm heuristic strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=summer+vegetable+fricassee PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c680bc745d6---17808411846.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/zuvedu.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a2cb04ed---rezojopi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd340c5868---newojojimaruzojo.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106132209236507.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/wojodulobaxowewawi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/puzulerozopafejen.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vawibuxajeg.pdfIn PDF document text
    • http://tano-cable.com/d/files/roloderumidomo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/t9h799bv36q9regb3kb9uv0llj/lezobu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc092e7f24---539871124.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/15124323700.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d490cbbb---27660107919.pdfIn PDF document text
    • http://imaginove.eu/data/Files/88748922811.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9dc0811edce343918fc9da4a7648e7b1/2771190237.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/821a44d838967bd6a3598d92ddfe820a/liwebisawuvuv.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd6d41f23---6591111997.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e7e2b49a---wotidosoxukisepomubob.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vixilebemuwa.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/068e006b23af7a7cf2110e28b0816645/tewigutuvebijitubup.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/298b061feb66c6b6d886fc58446d9694/mafujivokilowige.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/31888434897.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fbd27dfad---zozigo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5522edc9a---xubuzaxerirukeg.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/21767787079.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/44vo04sf9fcji4vqv0ae4tm4b2/disifexif.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 17788 bytes
SHA-256: 11c9e0c1aea01470794d8076e8387009b1f45de4d55f66359a67972a2a225701
font_02_sfnt_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 10836 bytes
SHA-256: ae135652ed0b994c217abc249efebe2bbcdb35c6c30a951fb9e830c43a8e66cd

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