Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ecbe98b341789a…

MALICIOUS

PDF

83.2 KB Created: 2021-08-24 02:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ef3486e866c9fe9e92dd9faccb590704 SHA-1: 979307390194af79729cda6dd477f7e9e98f3a83 SHA-256: 52ecbe98b341789ac5dfd84f1f2e949c2335225d4e7f33e47de9b9e66f590afd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to numerous other PDF files hosted on various websites, some of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://studioriggio.it/userfiles/files/jadaxet.pdf In PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/zopopu.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/84253662716.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076912060cb0---66727125584.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/rareburevabukobugetibed.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/93119684508.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/afd4835fe87981c7e3a8202d070ea85f/jatedirorijasojuxa.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/44718570624.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tq5v8eha32og6hk4vg5p0hjm2s/15407503455.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/58999309362.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/zetirofiraxix.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dceac19aeb5ba86bb1e384480865a7b8/refazibuve.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0684be6a54---pugolabumopuf.pdfIn PDF document text
    • https://yuss.itfile/gavobunujowemumemu.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/95213693862.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/lavujakuture.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xiteraramoxisow.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/fozupuxikumi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/37768809475.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/10408311171.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/rolaga.pdfIn PDF document text
    • http://0930actress.com/files/files/momagakawipawa.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/69759604365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=custom+page+border+in+wordPDF 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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 11048 bytes
SHA-256: a6bf417cc60407b5fa1a1107db61742a9aa518fc842bebab47c63f5334266e58
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16504 bytes
SHA-256: 63f21a3e0d74f9d51361ebdba05744a1b85a49c57f8b3752c891454c18c6fdcd
font_02_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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