Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e53a94c4dba8dd…

MALICIOUS

PDF

84.5 KB Created: 2021-07-14 02:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22946ad746898114d4f2ccd0fa41b3a0 SHA-1: ab5bef786205cbb10938567e94470c6a3769cd20 SHA-256: 65e53a94c4dba8dd7b5afc29f075335518a17d693a7a1db8f0dc9f5b625ca949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=mp3+songs+free+download+for+mobile+pagalworld PDF link annotation
    • http://allycatering.com/userfiles/81623306907.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6aed48f173bcefa2015e2e3443cc938c/86903167515.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zoruzavavavigupikenis.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kig9aj3nbk4scrg2bn9fmggos4/31764293145.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/68633415880.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/konujasuv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608559f3651ee---72472650820.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffcbc4a38---32603672071.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/72584076936.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jjhlgj449vp0bue9vi37et6mof/71611748795.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/98891944993.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a28b514a---79688772226.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lomowuvuvudifufizisuwezas.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8efc3b4fd07fce0c15f483e2719860e/38472136720.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d43d59a6f---mupiz.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/24088145522.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ccfbe52c---sexasagudominadunitagib.pdfIn PDF document text
    • https://cristalensi.com/public/File/jijatodunutedelomemo.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/wujexudivixuzuz.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739bab31e7d---winarawabazopeno.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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 17124 bytes
SHA-256: 8b5bddea6767af8718df3ff7495d0cf712aa574d270871dadbdc415d86c1eaff
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 11132 bytes
SHA-256: f721f14a87c91eaf8a0aa2f48a76f653ade5f0250abbb7a759e56d7adf48f480
font_02_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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