Malicious PDF — malware analysis report

Static analysis result for SHA-256 3955b2f43a77d159…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 06:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 12b97df40467a08c84adb2ba192f2984 SHA-1: 621758d1229318dfed1bde355bda7649b3158eac SHA-256: 3955b2f43a77d1593ec35a309e7253fa69e0e24275a5a6cfa16c4ae4286a28d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aceonlinementors.com/userfiles/file/pabomumogaxujudam.pdf In PDF document text
    • https://digireg.ru/upload/xajazobi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609100bc523e1---86084164985.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/togurudemusisek.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506170857118658887.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/12945262993.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/7na4o46qh5040o0ke51812rdf3/92877202598.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/t1bs51tq31tku9b4l8obvu10h2/tarobaxizobiludebotok.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/kuvonad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4584610270c3730480755b5a81695991/nasimadevale.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/39532656525.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vimuna.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ca3d4a57---76558743683.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108212100047501.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/ruparijujulowosujupawagu.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/pajisuje.pdfIn PDF document text
    • http://orderkai.com/uploads/files/nunuwexuridu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/41619567202.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/gatiroz.pdfIn PDF document text
    • https://kultmotor.hu/images/files/damasugudarifi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nsq2k5990325r22g38j1s8g4qi/76243497232.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0fiibf92j8q34rftt9n16vbu34/5180757556.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/68775721402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=maintenance+engineering+book+pdf+free+downloadPDF 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_off0000c00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 16976 bytes
SHA-256: 85aebd3008e74a6d184c101f91633952733998c1df529ea2495a9dac4560e1a2
font_01_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10936 bytes
SHA-256: 860f1ca58ac10582ece001b8f7012c0cd6157b4dc7c5cb23d02df37e02028c20
font_02_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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