Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6633d4617a6bfa…

MALICIOUS

PDF

81.6 KB Created: 2021-08-21 00:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1cf3fd50510e1b22e7a3b311dfb549a9 SHA-1: 3137f14f138ba1a5f3fd0abc8ba4032fe8bf8ff8 SHA-256: 7e6633d4617a6bfa8b652206815aea09c23efea30e82d6788d6166934e47a1a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=popcap+games+collection+free+download+for+windows+7 PDF link annotation
    • http://caratow.nl/userfiles/file/gunexibolijidebilidujifik.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/17233215298.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be33a8b11---govovagefafasiteletobona.pdfIn PDF document text
    • http://chineseclothingonline.net/File/60960050990.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdbdf81325---widivodurewovowes.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/70559773501.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/82894016072.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c351022da0---58047897905.pdfIn PDF document text
    • https://arerp.kr/data/file///1340230631.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160720b3087746---buvisewijekawu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/pidoxuvewujibi.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16292406436434.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094476b3f17a---geniparuzusawajopovesefo.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nijoxomubuxuvozabidaril.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/81448d73e7025b6478abee4d1cef96de/suweriwojatuwelejinedaz.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/25270498628.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/734160ed32d83041452cdcc7f700a3bc/digibufudedexezanenajoji.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/37661525157.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d23f73e99f5e62e644d45b6328c3f6f0/xuvasikojimujitesovem.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/1273347688.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/af6a4e7aaeb4b8db3d3d15ebdde01731/84827477446.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16396 bytes
SHA-256: a01907f0386779acbcf8d5e2bbfbcd27617260f39c8302156dcdf8eb673e80d5
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 11100 bytes
SHA-256: 2aabf562f65ec4cd2165e34a1f8b97b7307da005f5b89e5d22e40d1b31598aa8
font_02_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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