Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbe3dbfbabcf2e3…

MALICIOUS

PDF

86.1 KB Created: 2021-07-08 19:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bed720a225d2ac0f6145e9dbaf0c4ae SHA-1: c456deab369e1c25a23967005f921321780e4d2c SHA-256: 3bbe3dbfbabcf2e30cd04dda437cd5a277de2ee11fad84f0797e5870c438e0cd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The numerous external URIs, many pointing to compromised CMS upload directories, suggest a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicates malicious intent, likely involving the execution of JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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://catamma.ru/uplcv?utm_term=healthy+and+diet PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1ffe15cd---valaw.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/voxefufazofewalejexina.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f32a1c3e---gobenufapurubatolovofa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rt7ul78hs2517ets3sbs3qldn2/61828471607.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c359ff4033bf16041b38a757d049ed02/56874995158.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607755b748126---13868345213.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mivopo.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/bazirawimofidinobamazoz.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xifopojuruvorovopujo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1807f6f7db2cedf04dabb8d84c1066b0/87052105771.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4429d8a3---30764735099.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/32641717214.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/fupos.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6e09a728a780150f57ae6010f744116b/nomejudeferutesuzupa.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/50833622173.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/17199186672.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/c5e502238f6cc60547c425e7eef1dd59/kasilupuzaxivoxafega.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1c4228bb---xanelavapikiteretobodonum.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2624259638.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6483254c5---86679025819.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60ja2dpcnbseeslh71b37rq9c5/30681006076.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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 17620 bytes
SHA-256: ea6ad750394ee69ae05721a75954e8b15518647e8ee4d14e1615f6fa3c0291ab
font_02_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 10064 bytes
SHA-256: 074806b6b1655fab4cff05ba1de77083617dbf175ab9bdece780d7f092a7a24a

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