Malicious PDF — malware analysis report

Static analysis result for SHA-256 0879d25f8db6570a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-24 09:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19a0176a1685f3ec3bdf1d66cba4df7e SHA-1: 659bf249ca2ff25f7ef4ac0fe74e12dcbafca5ab SHA-256: 0879d25f8db6570a1d753884a33388949628ea03fc43f65758d426f96f419f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9498aaf59---vosotamujegixivafuvopila.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7293c11ac---59165892090.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/33308126225.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/51978548241.pdfIn PDF document text
    • https://khanikango.in/file/8667128562.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8292362966---bilukanefox.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a1ceae7a---53526293955.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gufaxexeminugito.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d0125d9a003bc559cdcc1ac5c075edaa/kubemafijotowino.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/nuwigeliv.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae374c902f2---16270827769.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4279c6dec5---88248095181.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/megod.pdfIn PDF document text
    • https://mytopics.it/uploads/file/70926039037.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/rupukitiwowomuko.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a3d32102---ginufodifizipexu.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/zixomujixuvu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4b9si38l6pk4325mfq4oouf86/86182627242.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/84645043403.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vukosuxoxo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335472ce2e---32678977487.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/33797685971.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/75817272663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=periodic+table+of+elements+list+with+latin+namesPDF 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16836 bytes
SHA-256: b07b15b6df7a72d77ee0d32e377b19321abfb402c6065c027039077834937f58
font_01_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 10968 bytes
SHA-256: d2bda7ab72b2d2464b851b018f824b85c7c6efae7b11a9ad483e6a886e208431
font_02_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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