Malicious PDF — malware analysis report

Static analysis result for SHA-256 303f06af85f7c33f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 09:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bf9c0bcc9b8ddb9cae93c3a00e9966f SHA-1: 5981a991edf57e897ec44f36c74d88898b84b216 SHA-256: 303f06af85f7c33ff46cd2fd86887d0d4fc7f185fcd877dc7281ab54c542e2eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a malicious ML classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these link farms and compromised hosting suggests an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mulroyenvironmental.ie/userfiles/file/gazox.pdf In PDF document text
    • https://partnyor.az/userfiles/file/mumerixuxufenilid.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/85741926599.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/6080612167.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/takuwefurolidubuzotaba.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/lizinumoruvixuvunafu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609697aa40a04---pororituduni.pdfIn PDF document text
    • https://finomisgurukul.com/public_html/userfiles/file/tutegenaxebudi.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/61391398972.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1c4e7a453---wakedomosemowupasowuruz.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/3846735235.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/nu2m6o5abgag8t457k9vo81ga8/3088345129.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ca6eee9d---78193334483.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/derekax.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b059dc8ba04---88599899314.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5d3dad65---bupafavumolofabavutupi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/58947464285.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210614010909_wyc6ei.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/33403734503.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/39081164308.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kirirorevejozudimorobela.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zepesoxeba.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b5d620f5991cf016abd8626de886645f/dojoxerakizowuse.pdfIn PDF document text
    • http://hainfelderteich.at/resunetobepozusuvomevori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=placa+peccinin+cp+4030+manualPDF 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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10520 bytes
SHA-256: 36632902227e16a5c173d0e48a5bbc76916b97cef9555232d1f36e36c4afb939
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 19128 bytes
SHA-256: ac30e3c3de50f7e8daaa82f3302a6ac21cd9dcccf6f436393d0417958db240be
font_02_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1