Malicious PDF — malware analysis report

Static analysis result for SHA-256 caefc2a06810640f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 02:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8694f41122fdbba9e508ae48ba82636 SHA-1: 7e62f07297c7331ea4e548661384b3dd3b5b8402 SHA-256: caefc2a06810640fd0ce4a2c9b32dd23ed8684f33d26c414ab81fd87fa54cbff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=minecraft+latest+mod+apk PDF link annotation
    • http://mskabel.cz/UserFiles/File/ledazuzasozi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nomujakiwulokepebiw.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/varekivazeze.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/92136614580.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/03f0da0a344cf67af436a1775fc11e53/fuzuxitavegurutebodutetex.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/53289544081.pdfIn PDF document text
    • https://tsegypt.com/file/netibisufidodomuwomex.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/82589378932.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vovifolimujala.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/kugoxisixova.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/90139165088.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetefupalisito.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/96123584647.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/kofatopul.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/18022747852.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613939aee240e---1401597915.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/78000349226.pdfIn PDF document text
    • http://hkacca.com/userfiles/xugupegafudunuzowapepoxu.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/nebomumadana.pdfIn PDF document text
    • http://feminella.ro/upload/fck/55155753805.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/57663505709.pdfIn PDF document text
    • https://aromamarketing.md/img/files/dofakagofaxosemi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/33725672861.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5j7t10lp7ccq8j1sonj0ti6jh/33849283283.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/65916041178.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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 18000 bytes
SHA-256: 715c3e5d03fcfcfc8bf015cce7cf75cd69fcd5aa6548ad36b47bdd79e2b5cc4a
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10868 bytes
SHA-256: a80d447c494df17eb42c4dbca403d2856398cb4cb14fa1dddf3b2f58f05c32d3
font_02_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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