Malicious PDF — malware analysis report

Static analysis result for SHA-256 5671e49597535091…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 19:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7772af5d7b3486138040b7c66b4789c SHA-1: f72c61f0fb37f7cd84d99a67ee9378d488e23b7c SHA-256: 5671e49597535091cebf0f26bf2a8a50f34868f7cf037d464ba5754575cea5db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=all+the+multiples+of+8+up+to+100 PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ccd1c673---71085507692.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/91337729346.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/vamunulutolaxowakubixug.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70149168217.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078820ec7116---50036074171.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/61638017683.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/944252729.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/53101709991.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/33869189308.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xasezovawapizajalexumawip.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/79466695237.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/fuzobirebexojekusoxabodu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bkba72ul7mfl35rnuraofn2010/vinajubimamuvipidakilod.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bb21c146e---wovinexoxemejatasevav.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227988b9c9---latinutetuse.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/39304698608.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/guxufozujojusejanarenim.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/senaraxunavoso.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/rarukibokojapuko.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/24n2e6hae0f3h0mjiet7n2vk20/tajigidesidipupazuwoged.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210723/1120064789.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/64149968360.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/leruvikimalodawu.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_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 10720 bytes
SHA-256: 7fb6380685b0339babfa44a72bf1bc0aab38cb139ee06085a1595b511361530d
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 14332 bytes
SHA-256: 2554fd6b12167b3689cc6c8909465cefb3d9035a2981cab8b6293770cf2027ba
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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