Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9978ebdac44e307…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 02:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b72ce8f659022254c68b9155cb75e8ce SHA-1: 6b5a3caf9f6523bf8c2821a8eec42641d51c6ef4 SHA-256: b9978ebdac44e307a1b238d6a526526d670c5c7d69109d2f96af24cddfa66e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links likely serve as a distribution point for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cd204b1d2c4---zadaxozesikonufobovixedo.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e5297d37---9640530779.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2e8d4557---51679279487.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/97388342642.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e99b36d39150b4bc97054baa86296d8/99065306923.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/polipinunekovo.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/gagukimazebafaxovewoke.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6f5a3d3c---10199987031.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/xupedaxanebusiro.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9f39bb05b3ae61853c2161d85b7ca0f/93602548452.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/wumavirokubakamimibe.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/44552714691.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17739633599.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c751c7e71d2---vilusozizotu.pdfIn PDF document text
    • http://benetalent.com/upload/files/senodugifuloz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc86714111---fuzumafoxo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4090634c08---tobip.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9a6ea3b3adb61a6c9628ded805d12bce/manajetavadejadag.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff25ad5ff---64223421573.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/52645595822.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/towozurifojune.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/32090819325.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/addf3695e9c39ab63688ef777ab775d2/46850101768.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/47cfaadb22b5d7dbae3003827fd27336/xokonetaduporivej.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078905632f3f---ferejijer.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a7bb5d41fd066aada06647211a6aa23a/71731294513.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/rebofokuxupamamulelom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=repository+of+manual+pagesPDF 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_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 17528 bytes
SHA-256: 7b64dcbf48652ad7822b886f4ff1f54f8324b7970654918e6d920374d6ef6bb2
font_01_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 10960 bytes
SHA-256: aed80659ebc5330afd7bcc03c6be42ca177e69271efcc5eded88beb70350c473
font_02_sfnt_off00014553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1