Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ce9ef3a18578f4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 14:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74cdc4405a4651c0c4f12d370740daf1 SHA-1: 7975cc63a70c2a7242795aaf06254de25673c33b SHA-256: 84ce9ef3a18578f4d578f0c4ddbd3144e916a0f15ec194e2c396adbc82e011d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm structure points towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8f2b0b95049b343116fceaee297119df/59476808559.pdf In PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/bewixumolagadofupelefofip.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0a400946---sepilipadexa.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/siwilaguded.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/jujepidiwivekawixerasup.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xikaxurosiwol.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jegomalalidasukazo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132523dba1fd---9936452410.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/23515567637.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135d72ef1476---86112428299.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/23570909952.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zawuvobujoguj.pdfIn PDF document text
    • http://sksound.com/userfiles/file/tutekexefisixefaxemebejun.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/45872529700.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/71288095246.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/mumamolamikop.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/nuwimarowawunaxar.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/65590793599.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0a58abc9---dewemewitizasovije.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/42313679836.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/xapijuvulazivukegokaxe.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/79982956195.pdfIn PDF document text
    • http://195exim.com/datas/files/29832944742.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/vifozanomogufapusujaxapib.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/mowupuxematu.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tesagezewekerokotedab.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/fanub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=garena+free+fire+mod+apk+new+versionPDF 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_off0000bbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF9 16056 bytes
SHA-256: 4b5dfa7bf86d22d135498ce373f87a9db6d582febf213a1bf3d48c5bac04488a
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 10796 bytes
SHA-256: 89c8764d2dec7870a6c64a140534d8018646106f1f50312aa75585b10804ce32

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