Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a7e0e0753679a4…

MALICIOUS

PDF

111.4 KB Created: 2021-09-06 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59b5f325788454c9ccc6db7cf2277a19 SHA-1: 97fdffde121d48a08af8a07163a7315bcdd9e6fd SHA-256: a7a7e0e0753679a499da4bf0196febfce0776c4246c0f3c7d33420ce30dce258
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4d0fe2672cc923d3e7d5e2bd64f18edb/lojarofuberuvolixefuda.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/92601697846.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/wowimuputixizutimilosemol.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/ligesawoxumikipobov.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/piwavibodolog.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/79270143962.pdfIn PDF document text
    • http://allasclub.com/campannas/file/16012327018.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/453a835ce97dbbc557c11f2e8a9123b5/fuzav.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/45826518365.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p1fdig58a9h1ckf507um3p60eg/valavaxanelunilo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/gizolipejina.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ae39806c---lefonimizivizupizabonunu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714506981cb---bololunakusijuwanonili.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/3qfv47it9ut38tkaheqln1et5q/dalixofozesezujujaw.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/rofar.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zeziwitejotolemeke.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/63813030708.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/60611968231.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/24159283779.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/de4dc89182a822b053d7950bfd8537e8/54381829030.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e794d642520---44506509314.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607886edbd65b---82713603911.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77597858542.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/bezikazawerofuligowuginog.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0447650a---lawuxojofapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=essential+grammar+in+use+third+edition+pdf+descargar+gratisPDF 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_off000146a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A6 20356 bytes
SHA-256: 2fad97781b5434a2776cd60f274b1fcc6e7c36edbaf52eec635ea0eff1df1a4a
font_01_sfnt_off00017d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19521 11152 bytes
SHA-256: 10805cb9c29cc8866496997d2ea11d06275013dfbdf285a02357044a6e137a92