Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e4458073824438…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 03:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cbf33013175ee1d994963350d55d6b8 SHA-1: e5598102719eec4db8ee28364259b352da5dffc8 SHA-256: f4e44580738244385637452cc2448e761d0f2ea41d7d9e7c6e2a763cb67a6209
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic firings related to link farms and compromised CMS uploads further support the conclusion that this document is designed to redirect users to malicious content.

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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c64eb23b878---liseburoxamuleleredog.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee02aa1ca1---87825728488.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/26078724143.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/xoxiwugozikufozirano.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/dobukuvebuboleba.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/pubagazupa.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/13592322699.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210702054631898.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/pixapu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9c79f012e5f8eff4ec46993febec6331/pakuribatuver.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607711f34104d---85540200723.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084030ab31fe---jorewesatofawam.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305031c760f---27194650195.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/39576404961.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/koxadekujulareves.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f56131304ebb84c469a88443c6c00d78/kilanevovexuwote.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/46983508651.pdfIn PDF document text
    • http://healthywithhart.com/res/file/gikawenegobebigusevag.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/fevelup.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e1435fbb---9198354382.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/41757056299.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/rokufafimobukosadexubek.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/79836138701.pdfIn PDF document text
    • http://szpk.hu/_user/file/petovejumapufapoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=conditional+clauses+without+if+worksheetsPDF 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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 17556 bytes
SHA-256: fac0d4dff5b11d8fc3ddfc4dd1f015fda49ac99df8597e8c46d7f7361787a5d2
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10880 bytes
SHA-256: e2a9d3b9e184787745285c692bab06c3567fefd2d7ea5abfed7a9346445f6b14
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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