Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcde8a678e9c17be…

MALICIOUS

PDF

95.1 KB Created: 2021-09-17 18:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0275e61f73a8ba2b76d0a586b99d5a98 SHA-1: 6da8a5da21786f53f09b48cd85f6d52944deb76e SHA-256: dcde8a678e9c17bedea13f723240e4bffed1569b507f1f7e60b97c8f41f14676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm indicates a likely spearphishing attachment used to redirect victims to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ibeguiristain.com/userfiles/files/88441311648.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130000cab04a---37906802720.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/mimeb.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/74771187165.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0e670f78811f7da19eba3756a9b52953/86380136436.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/2018165591.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/kitukipajedakokafuverikux.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210904055424.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fovejupumumu.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/85484115187.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/21884858968.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/47066507961.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139123a2f1b9---44598235006.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kipuwa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bb57f3c9---8901194328.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/xabox.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zamarudagoluvukavone.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/79459050606.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/difatuvalexufi.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/xigiruramodorudore.pdfIn PDF document text
    • http://mosjob.ru/images/file/xisazemaxu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7ba2bd7a---pitosugofavew.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/22609381258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+socket+send+and+receive+dataPDF 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_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 17752 bytes
SHA-256: 6d9a64920080a32c966b39a5a877c7ad106bdfaa608714a3c69776f9360e9155
font_01_sfnt_off00013e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15681 10456 bytes
SHA-256: 34b5abf977b3876f8558dc849368434c8344963fa8df33decff17e5658af4d80

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