Malicious PDF — malware analysis report

Static analysis result for SHA-256 a455d26124f8f83f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-30 13:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6c7162367010be9f6e990f790cb0652 SHA-1: 19b1e3a3cf4f353e9d92499b6cea41c29b53ae36 SHA-256: a455d26124f8f83f331956f54bc6a296cd659ca1abc145263df737a8426add82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are identified as being hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm strategy is a common technique for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://goldmustang.ru/files/files/21866741126.pdf In PDF document text
    • https://xyoaa.org/sites/default/files/files/43527580120.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/84b3cc784dc52a1f0cde3c2ee5e708a5/xiwuzejesarofufonero.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/gadukumelinidulelago.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131beedea452---dazabel.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/bikax.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/41311416474.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-12/20210912085045295419.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615079fe7b9b9---52217790549.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/juvozopuru.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/zofotagugakepu.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/87119348920.pdfIn PDF document text
    • http://grafitym.kz/files/file/74005557893.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/titemijepugisapitaga.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210909103829.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/17882656903.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/xipavimipinexop.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/34888961561.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/xowasexupekagefenidi.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/jigof.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/43220533458.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rusovim.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/83283517673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pragmatism+according+to+john+deweyPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 18908 bytes
SHA-256: edf8556691aa6bfd5cd6e25a44ab7ab748c0f68228463740f70ad2d610e03cf1
font_02_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 11100 bytes
SHA-256: 1d76c0eb5654a244be82a8f607ba748eb4f9093ec73bc9305d2733ff45e4d26a

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