Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd253280b57ac279…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 04:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50d860ad7a10bbc0b75a6eb9a9b7a5f7 SHA-1: b9db2608e017ea6552c32f519da7ec6c910d5f3f SHA-256: cd253280b57ac279bbe19c704d478a00dff890d0cfd97ca8fee4058872259965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The document body is unreadable, but the heuristics and URLs are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ecadbee---xawipetoduvu.pdf In PDF document text
    • http://ristorantebiscione.com/userfiles/files/98709762055.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d424423---39665453846.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22710641443.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd129485df85f591714ea5ead76b7f82/85397064281.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/25823707499.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/33500204416.pdfIn PDF document text
    • http://th-hl.com///upload/files/63367848607.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210912142530499.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62716e169---10305832784.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/59480317019.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53658140229.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/zisaxus.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wamoj.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/kebozuvidebe.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/78328762829.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/93497745819.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/40056047843.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/35018838335.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/42211207542.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144530f4f1b8---50834235631.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/jixomadovakezifaxojabawig.pdfIn PDF document text
    • http://allycatering.com/userfiles/moxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=good+manga+apps+for+androidPDF 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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 18056 bytes
SHA-256: da737f5cd761e0ebaf95849febc17c0e9fd83b23708cb6fa8f91dde59787102f
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10604 bytes
SHA-256: aa830f9b7c9a14f9aada5707c3ffd225a94afcaf872f5b2f1f59096ac2258024
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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