Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7319a2bfe78e334…

MALICIOUS

PDF

87.6 KB Created: 2021-07-19 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a7ba4315a0589871070de40f490a769d SHA-1: 4cbf47f2edf1af32d6cb408a0b7cc7c29d29eafb SHA-256: c7319a2bfe78e33411f06964b35d471e4b73640de101f9411964cd25f06c7a3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2bd58dk4pos5ms39h1v85t7c9/81619354856.pdf In PDF document text
    • http://prosquash.by/data/68576580618.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/vakutixufaxumu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b2gcpq3b8uag52kdc11ekiqcsh/37834811999.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824d4a980cc---zelazevezijazo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0cf7709bdc050a0c4a28cb78582a1c15/lesirevesokat.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sakutexusebisesimekabo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ee43c97dd1750d602ba011f0c64e0657/97849624803.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/037e0904fdf3974f614e66ae1c0c32e0/tudenugojolotidazere.pdfIn PDF document text
    • https://manenshop.com/upload/files/gosazipulade.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/kofelozafelimenekira.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a7fd96921df0e28ed10ca14d2a865d85/jejujuxo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609278f198195---98821429297.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/69c8a852e2789e5eaf8d64b9ddd7ea34/jogadigevagefotowepije.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/tekafabideposatafo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098acdbebc3d---wisuzadixikar.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c1f8092aa950ddd68c5f05fe5311f3a9/1675575269.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2c2ed74be2d718422592fe8361073096/filugukubijafikilesutun.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/fc96bc07e5067871ba4cb4cdb58da2fc/25521312039.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/864ss07cfe9hm1v7npogsinudo/38424739794.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3320db7108---zolubo.pdfIn PDF document text
    • https://digiconelectronics.com/media/ditokekapem.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/69788263145.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210716_04296C8FB461B068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+land+of+open+graves+living+and+dying+on+the+migrant+trail+summaryPDF 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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 17412 bytes
SHA-256: de1bd0d43cb5bd4634cdfb83fbb0082d1635fcf32ce765a5aa4e38996e081131
font_02_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 11188 bytes
SHA-256: 9da7798e6134290c4f4d982f256b4c65e4ec0cdb59166a6843b21c936a32d77d