Malicious PDF — malware analysis report

Static analysis result for SHA-256 61848f3841f4ad96…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 20:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fc675cc6f2205676fa03490f6b9c43e SHA-1: 36a7c3e1fe1b0f6b4eb701517fa70d0adbfa0fb5 SHA-256: 61848f3841f4ad96d392cb1d2c3a19698845087b318c867905720ebe362362aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ada0a56d---xuratupogozevup.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/suvusawitovofuvoniruze.pdfIn PDF document text
    • https://ntc-container.com/upload/files/kimizilodegiz.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/sovubevetopo.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/27350540026.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/82834281894.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5e29c9bb---10494680750.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/gizudazunapilatap.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/jegimuwax.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144129a51a88---rizimizusawenuw.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/46318356454.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/73712377137.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526abecd8---38677489044.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/75570592353.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/mizobuta.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109121422392820.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/dinuxosibulutarawerabarun.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161344ee449d8e---sakejotaredatene.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/situgaji.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/zetiruzubekuxekibisuduweg.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/84079431975.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/dekesabirikatotamipukago.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/20341507852.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/79018179010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=andy+ruiz+vs+chris+arreola+livePDF 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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10692 bytes
SHA-256: 890f978984a6bc57cd0114c36689aca202dc53ebf3fa71d26d5ee1d7e3869a50
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 18140 bytes
SHA-256: babfaa30c3b999ea184a07d6ffed5135695ca10038bedf8b04b09e0ca819c13e