Malicious PDF — malware analysis report

Static analysis result for SHA-256 65daa6f0f2e0e4e7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 17:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5be1a3e0d0fa18947c91ecfdedbb5038 SHA-1: b034f84a26286307a795d5e3955e9ce4c3d4de76 SHA-256: 65daa6f0f2e0e4e711a6b031137ec83865e00e07acf96715359b5e7d716f8b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs pointing to various websites, many of which are hosted on disposable domains or compromised CMS uploads. This structure is characteristic of a link farm used to distribute phishing lures or redirect to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lpkgoodframeupvc.com/userfiles/files/1606009674.pdf In PDF document text
    • http://ls12368.com/userfiles/file/nanevikuxuwukapi.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/76495542804.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/pupokafi.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zodagixemoz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161336d5696d9e---supaburoxiwugevapo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef2be0b7---49551213654.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/63324845264.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/18440657946.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/tawab.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131833658c34---puxonatipowelumanabek.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/91247518558.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c987ab79---zutavatakifomafojen.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/lefowopedise.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210908_142910_7089.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/xizorekelekew.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/30608176928.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/gojifilozamekuwanorazepa.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090420074373499.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/vipubevitugor.pdfIn PDF document text
    • http://balone.net/_upload/file///mexuzaladuro.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/valerunumizugewa.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/50271868835.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/59820091337.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81717f8ee---47364009432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+help+forumsPDF link annotation
    • https://mediaget.com/userfiles/files/bovudow.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_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 18268 bytes
SHA-256: 61aab01a66953c5b554d066c9eff695b3666885715aae50b3ec988787af607e8
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 10584 bytes
SHA-256: 6c4b79e0ca5aef09baef76726171c92a119633a80dcbc12ab502e09101bec316

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