Malicious PDF — malware analysis report

Static analysis result for SHA-256 498ff43e483bb5d9…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 06:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbec0fc72fe2dd7826aef5f2f46f3313 SHA-1: 3954c5fe1747df9c449311cd16ba41175c0e62ef SHA-256: 498ff43e483bb5d9ff953145fb97e2cfd659f27392f5d9ecb3b72a6eb431a755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to obscure the true destination. The presence of 'utm_term' parameters in some URLs indicates a potential SEO manipulation tactic to drive traffic. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9c3eec5b11e6b23270d937e3a1dd6599/34190753411.pdf In PDF document text
    • https://weddingitaly.jp/images/file/391429488.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/521450c563956b32d6e4d99473669e23/37350066645.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/86f2cd23c2f8b358b8e90fbb86401ae5/52129647446.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210613143319.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/levimuje.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095701ac14be---20589499608.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/tunorusivadojalulimuvu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fls93p65deqcbqtgjv80i6efqt/kijoritaloxopijuzo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bb0e070907f6879cfe80c75a83b36f86/vufufaliwewusuvinetedomu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2219e42f---147568615.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/55fqhlgvlqcfln43kfjgl2s75t/xezorezejorekipopuxopo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/39f3425dcfeb9fa15aef8215c9aefd9f/31979116598.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/89004549947.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/midorivofajozulimopib.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06162c62---zonusodigos.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/98371855376.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6dd2d9f9f96c3e2ea11889e2cf0df601/mumofugixesosidabomabegi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/49evjuon29i4hq03bvq6mdprbi/wodebi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009d142c7e2---gopogizukuzafefiwefa.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/suxorew.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/38070088771.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/52ca21db0ddf51c2b900a09a3317c33a/37698853023.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4315f6373d---99493417445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+hills+have+eyes+2+full+movie+in+hindi+dubbed+download+720pPDF 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_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 18532 bytes
SHA-256: fc45b814fd974661750d97fbe364e07a2cc848864c31aea2e3d8e5c69399c016
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 11324 bytes
SHA-256: 0b6d035b530e44e103f7043bbfaac8fb0f7d1be24fd749419f60db179283af1c

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