Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24fa8430b30e098…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72ddc48b1b0aed6fbd259b378eff6b42 SHA-1: cb206e83709f5f543ac0d718b839b041a73c9805 SHA-256: e24fa8430b30e0986466ff16898d2a881e4c7ae74e5001f70a96ecbe0d138dd4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an intent to redirect users to malicious sites. The presence of these links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://easy-sleep24.de/shop/images/editorfiles/file/81238570720.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc65f3dbc39---lojenifivepozemewiz.pdfIn PDF document text
    • http://tencanpowder.com/d/files/84017013742.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/79342662423.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/nogifipamifixibiraxapemus.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/38027531698.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/pariwalujapebuk.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feeeed85f87---63316766775.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/sevomadoxutebavutor.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/63241485749.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e948939e008e1e6b59fbf0c648123ba6/75355247877.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160babc25e0bbb---rebuzajanetipese.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/lomibesavuzagugeladefe.pdfIn PDF document text
    • http://bjallstar.com/upload/file/97505210487.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5e3623d8a51702c9af8e303466d748f0/78222999371.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5731340138---65505695640.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/lemadivaginilukan.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/xelirodatajidumomaraj.pdfIn PDF document text
    • https://digireg.gr/upload/depizukakejobumafovime.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072701c3c0d7---6197614080.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/70934501400.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/2924596374.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba727e5c352---59744928185.pdfIn PDF document text
    • http://mp-journal.com/media/file/18392093185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=morphologically+complex+wordsPDF 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 18132 bytes
SHA-256: 12e84b8b9236695fe81d410f2dc1e2b8f18c86b8a9b2aefd33512ee4b785fa1f
font_01_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 11052 bytes
SHA-256: a885f42278c598c5b50fb77be0ca1ae159917c757add181ee49ba4f69fed9e54

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