Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78676254abca2b9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 06:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1a6d308a5ad1f9cd8eddd2a70a44c89 SHA-1: b7fa91903a903c7926a1930a753b864c1ca4f654 SHA-256: a78676254abca2b9b83c40dc52a8b436ebe0860f93e88f43181239648226d127
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links, which in turn host further PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6vj13k6a9sjnb3o9ea5hj0v08f/35568844271.pdf In PDF document text
    • https://baoholaodong24.com/userfiles/file/toxetarogovodolevo.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gazomijipag.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kapewasidegedikatif.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/41445382534.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210902113055.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/soxuk.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052205436851.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/976812267.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d466ae0048---vemomiparejedopigeje.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/42245880510.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/lawujubozikuvosoxuxedexu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613171a84c363---88185319382.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/60518171217.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/68187930455.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/18378804307.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/pazaganuwula.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zatezajazabaruxid.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/mejokoxuv.pdfIn PDF document text
    • http://checopharma.com/upload/files/dixabezosasojax.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/banuzenoxoderafukimemo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613978eeb8668---kebijatotuwejotemed.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a7c6b032e---83415855071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=train+sim+world+download+for+androidPDF 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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 10336 bytes
SHA-256: 53d358833add0056221bcc7ff117670e240e96c998c0430496a11bac4b4f1cfe
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 18288 bytes
SHA-256: 08d9e874b4b93876a665dead9b555a64f335da19d0a97e1773f510537a935165

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