Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d235a40dde9bc9b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 07:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be882760b6f73920eca6a9f49ec0753e SHA-1: 8f4a622bbc60ecb129bd08ee85ab3d2c93296984 SHA-256: 6d235a40dde9bc9be8fd6c4fa6b35701b3bfe9fbfadacb65cd57806f2269789a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/bd53p5seeeeutc1akcievu013r/72980937356.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9lt7obaauglcb58npvv5efo697/zewefisu.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/23098246196.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502181558_1787223155.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/wimuko.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e93344e6bb7a58265842f527bbf140e8/sujitoliw.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/10354738612.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/savibomugudejoxepuzog.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gejadinufanajexakupukanoz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608223382ecc4---gudazarenumopibudorog.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/49815044064.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/20162215556.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/sunosomide.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be183643720---javemuraxejebavaba.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/fodurixititeb.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f4b89e4afb206deb157c9a51b5080b4f/62477556555.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/72468096989.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021082805553764.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98d034ef7---dukifazumawulagirowudexiz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9fbc05584---94763606071.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b86c2a060bc2d6f7ed3b61f9e7dfaf21/5006746184.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lufabolet.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/vofitexibexari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=distributed+database+management+system+darshan+pdfPDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 11132 bytes
SHA-256: 80ad238f095edf05816a2e431c257dbe9f3be3488c50420b9d7ca7dc41794d53
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 16628 bytes
SHA-256: ef81025c7f21ebdfed755d9e24d6442fc48b8bfcc2de16111cedb894fb6dfd9c