Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4564b7710f8af34…

MALICIOUS

PDF

99.6 KB Created: 2021-08-11 06:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2116b5faf170a30ffd663020d6a407ef SHA-1: 7f7869f0a091a431fe6459e3e46fe75d7b9b6596 SHA-256: d4564b7710f8af34e7f4f8a7b63e68a7e1fed80ea1f34d7168f9675c587b415b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to PDFs hosted on potentially compromised CMS uploads. One such URL points to a PDF on 'bestforfishing.com' which is flagged as a compromised CMS upload link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lgdmmtvlln9qjag34pq07b34i0/28616568294.pdf In PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fabedenomevon.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/10177518012.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/15609318612.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/88681755830.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16b5d1c86---tesubi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/texegavozigefomakun.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/sakosivoxifif.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kibizijopetilatali.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3bb70b380ac8748206e4283ef6207d14/kugaxujajowegujega.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/8380637743.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/popaxalamorajafaw.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/kudakezabarenenerasepa.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/263c80100d6b2d052d4298b346a892e4/bivezedaxopomaz.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zekosabote.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/11424653384.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b61110f3c6---25874858301.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/faf23bdab386d0734a2a7eca9ffba4d1/zibilewipejudiz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/91745582172.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/4020641379.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad0529999---99080711831.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098c042b8296---59291383708.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/gumoramituwe.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gijujudovezamazozubavefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=el+principio+del+placer+jose+emilio+pacheco+libro+completo+pdfPDF link annotation
    • http://medlab.webd.pl/upload/file/92470216070.pdfIn PDF document text
    • 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_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 18120 bytes
SHA-256: 4fde312f2ffb4016753509b5fdc9abb61754b318b7db6e092a32566ec6e4fadb
font_01_sfnt_off00014b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B97 11140 bytes
SHA-256: 916112a4426bda124124e0083ed9fc9c936602e071ef6d005dbcf5b5f620f9a8
font_02_sfnt_off0001651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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