Malicious PDF — malware analysis report

Static analysis result for SHA-256 483687f0f56bba07…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80f9a951e43b795726d80d27ff072e52 SHA-1: c5abe725cad116d0cad5c8bb8865ef5c1e989a26 SHA-256: 483687f0f56bba073121845e64362ed7294da10dc7f9d5a0262e00200d348ace
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to compromised WordPress sites, suggest the PDF is part of a link farm designed to redirect users to phishing sites or download further malware. The embedded JavaScript likely facilitates these actions, potentially by exploiting a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=homage+solar+inverter+user+manual PDF link annotation
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/37793846752.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7f88371c---mamezewa.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7f9760eb---potiguzosiwawuzekaxe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50e2e165b---vofewe.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/8927403637.pdfIn PDF document text
    • http://ipceurope.com/assets/file/1505281227.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16111874687254---vuwudi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/disapa.pdfIn PDF document text
    • https://unaizahic.com/Files/files/lokadun.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/wasigaxunabifowafaw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1badc1e5---34263917708.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xoferokudolobudizejiz.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4bbb2236---23859079579.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rimr1utaj77leqslff79p8njkp/39867004732.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/04d91b75c24ddea709cc446d45deddbe/rutes.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098938004636---54587574017.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/borijoxigojukafenu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/26574338336.pdfIn PDF document text
    • http://altinay-law.com/images/file/91556925396.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/10m17qtaursqja04o2nsk0co8g/zezitawazegenelero.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/jekekurumelozafe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613081081705c---26646698237.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a4c6ca662e7e45e2bad6db01654d9484/kulusuxed.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/132035983.pdfIn PDF document text
    • http://sakra.sk/storage/file/46794524542.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_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 10608 bytes
SHA-256: a4ac90ea32bb6addcb9e452d803c6f2cb653794d2a4df9e43d06ddb88c7facf7
font_01_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16680 bytes
SHA-256: 604bba557afa07180db0ec25c775a28ae1f6eb659227b854936c55ada99e5757
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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