Malicious PDF — malware analysis report

Static analysis result for SHA-256 0323d53dbe1dda70…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 11:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba4e8c24b60b23a29f9eff785e75ec19 SHA-1: 801f04e6d50b5d398e7acb0be2595b38f2413733 SHA-256: 0323d53dbe1dda700a90b8789fbbb973df60d25d20289b89ae966016906c8174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ashioke.com/images/library/File/raluzetubujagaleposuganu.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519232533196808.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d837d6280---77622131837.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/pazefalumibinatewajapi.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/fanapasibukotanapokawib.pdfIn PDF document text
    • http://fields-on-earth.com/josasikusuziriwuvegalo.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lizozunuzobewakiwewurone.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/koxenaxorulawadis.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f93ccb71296fbbc2b1b19d5b1211000f/79157185279.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xifuzama.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/tawerisawopawimep.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/61715658063.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1e39dc96320ff09a9bd16a737e5776b3/witerukitoriti.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/otckbcu9emd7f8kh4fmvjoi3gt/jovediwev.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/790882886f53f9a26923b0dc75ffa5d0/18153198764.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb7925d3b---xunufadujezogofelufatana.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f078d4a2b---75679185151.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607895e63c50f---56649732582.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6250db8d4---mefudewogakomufewegob.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/94943303389.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb3620026---garevodokogifukive.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0c5a7c8efca7c7950d40958bf0ec5187/64882964631.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/416746262.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/04a9a37eef49f811852e7aef7c061d36/81042183140.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/vuxegogezipetawaxosavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cute+names+from+sPDF 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_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 10368 bytes
SHA-256: 17bcbcf83d75c77d680ab525761c9c829cc72861f20ad441d551b391da26f7b3
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 17172 bytes
SHA-256: 1eacdaecd260856629fd64fe79f63992aa7b248c6e57c425a54a1d6993bd6d32