Malicious PDF — malware analysis report

Static analysis result for SHA-256 053aea000181344d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 11:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d764f9ec317fe3be4011691240eee7b SHA-1: 7c9a18837c70022bbb4c587a0d022674c12f82fc SHA-256: 053aea000181344d362912cc43f77ee2aa8a9e4a638d266730946ebe8912b995
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a phishing or malware distribution attempt.

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://km2804.com/ckupload/files/59401435228.pdf In PDF document text
    • http://dagmar-e.de/userfiles/file/70734096194.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/fevuxesoxagabolataf.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/wesaloji.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/9962867691.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/60315434896.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b4e28dc2a7f392911621bd7254e6a425/95726387767.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/51760496687.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/jabuk.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cdcdcefd6---revowemudagox.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xegarujume.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/nomomanutuvini.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/zesotisiw.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vigabozawaxexajisorowokis.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/53e34o1v7qvf0quvfqvnaboff6/masadovugume.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/60212368416.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/jilowuwelubulose.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7fe33116---58248081933.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lokumelanabebowakemo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5366c1de---nilewuvoj.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/60422038352.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ajpto12enn4l2aklpc49f35p8e/zokudur.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ronofixoteliwatitajig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+hard+reset+moto+g+fastPDF 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_off0000ba3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 17068 bytes
SHA-256: 15e2700b9f07aed807e80a09a28baae3a90e7c67eea27f9866b6247dfc3c7fcf
font_01_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 10636 bytes
SHA-256: 1566d4df34fed95cb57355c1ad07e470ccd5a59f0bbc734102694bfdcb4f233c
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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