Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed5e443edc284bf…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 05:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 974e6254be3f260422fcfd25487c1b4f SHA-1: c9b12ad296e2eaf68b47b7ec12c509c9ea777504 SHA-256: 5ed5e443edc284bf27b412857c8cf9c8f2a1118d4c1de53bfc659fb04648376c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress upload directories. These links are likely intended to redirect the user to a malicious payload or phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f07ed9fea8---46555254343.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/c6nk1oa76sc8dl6e808on30s3l/55428713599.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/11d192b7fb1cede37fbc2b6955781746/pemekadorizibavoxaxila.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/17603475114.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5312225d4---foboxemip.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/92003518033.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/3067735405.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5fc2313c---20579231270.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621497191.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8009cdb567bf4655a3b3addda2714e80/85699896910.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5647d8ec8---woral.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/60044625926.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b421b6d8633---18678073583.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/45517993570.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021aea43eb---88896945086.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/32629283528.pdfIn PDF document text
    • http://midel.me/userfiles/file/botuwimexupowozizo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/julotiragiwiza.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b34760a78c88df285227b23a114a88a3/gebatuwasovig.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160901df7c99ca---97069884804.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/zokevafogifozakaxado.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7fc92330---lizaluwijiwene.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/95342232733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=marvel+cinematic+universe+order+to+watchPDF 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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 10880 bytes
SHA-256: e40848c8c2b4a0f1ee1b38aa1726c4ef474926999a347b6f289aaca8bc2f33ea
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 18312 bytes
SHA-256: 5f24937e8ab60c125f1cf723e9baf3c16615310490199103cf0941ef42694d99
font_02_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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