Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a684471ac472e3…

MALICIOUS

PDF

112.2 KB Created: 2021-09-05 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1841ca0b1a2e1ea0be0a624f9e6c0737 SHA-1: 72c86f2dbae18b94a4a9c7a5c3a548473e044a9c SHA-256: b7a684471ac472e38945e5f0ac329f11bf04e7052da53777abace0219dbe720e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://colantuono.it/userfiles/files/senab.pdf In PDF document text
    • https://topupdana.com/contents/files/6230408917.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/96889024536.pdfIn PDF document text
    • http://idcla.net/upload/files/jerosamuwokogijis.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/13494366922.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/jitaresapebuvejuto.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0ee2c187---72086090398.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/66836431794.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/wudaxezakulepilizegulu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pixaboduzinafap.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/josegosomapem.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4a0ad206e134bdc17b7eed9910014e30/25128157691.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/rivowigoposatogurifu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00d4cd795---gozilojuwi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe843195067---ruxevefuvogemuvitit.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8af5370310bad4c717c6e6c383df190c/detopoporimanolurugugek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd571520d---41692743407.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/51017870154.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/7382783313.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/20197b10116b1383ddb6ec11967f7b16/gapakebovoluziguj.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbdef5eeb4---22032305839.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/nuxadedubafa.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fe7b92755---sediwezedezanorukuzep.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dugufemozotiputamizuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=macmillan+grammar+in+context+pdfPDF 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_off00014bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000163ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EA 20552 bytes
SHA-256: 5c8bb4292dbe84225a1f149651283f85f2c95d24e4ff77850e616d70f443812d
font_02_sfnt_off000199f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F2 10892 bytes
SHA-256: 7e144ce1cc9e1a2ca94861e087542e7de80c56e42fe81fe532f50d40082a977b

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