Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9079eeaea651de…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 00:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87b544c10445f4a96f5bab17243667cf SHA-1: 3a4e3c7ed10f235549b47b3eedfb0d0562186abd SHA-256: 5f9079eeaea651de7f1de51582e6b74d5fb87355b33deddbfc6b002c26a23d77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is a link farm pointing to compromised WordPress sites, likely intended to host further malicious payloads or phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bsftbd99gvatm99lolhpo0mtb0/wuxosawominadomewiz.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f263520861---nawikizegadez.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6950d2b232aeaf093e6d4c9f28a86593/54889759657.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/fowugubuvovipakimiso.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3263d6b4---31774896420.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/23970263984.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ded0337479---34224555503.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cf327204b6bc73117d376a5c575a6f15/kiseduzedonoxatuworalunu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609243854ee0d---kikekofufabubalorakuxuze.pdfIn PDF document text
    • http://azizolace.cz/images/file/xofozuvezapelujewazato.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1ede01fbf30368fcd46389d4b2e9d52c/67463701147.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/23838226547.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160710c0a4c039---39004592697.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ac03e886cdef23721f4b06cdaecb28bc/rumozulibopovut.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f2f831653cb3fd92047441550559c5af/72484569724.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/02388f6501b4f08abe6416d1f584288e/zedeluladaletolotik.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/vatokekivirejizuwa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb44d00b---31291391688.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9698c178c---97400255737.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/14677781807.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/giroboturutop.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/46648150164.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/niwedefulejawepeve.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29882158---99992204047.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/69600544.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/dotinozasadetodoli.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/xavonoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=marine+macroinvertebrates+pdfPDF 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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17648 bytes
SHA-256: 5c34e720a1a881b55065da55532504558c115c85942e3990eddaa35bd158a844
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10936 bytes
SHA-256: bbaaca4c0345e77e448e592079d97ef2e3247c35d3c656999ffb69fe348aac75

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