Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18f58716441d92b…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 07:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08679ade05b2938cb493a7ed2e475df2 SHA-1: 62d5e54c5ca1c6477f0a3b9d6d299e78e7d698ae SHA-256: e18f58716441d92babb047c28dd795dc2adbae530037f7314f71cca8566c8172
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of a click-outward action and the document's small size further support its use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medbillings.us/lightspeedweb1/file/86328962704.pdf In PDF document text
    • https://valergences.fr/userfiles/file/73589870522.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/temilepezijovelod.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/10296404846.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad21344b5e---disojuwixumiba.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/netigowizukobeba.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144336a21b26---22829640384.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/raperedisegiwojivezokufav.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0a3dd78264499702f8c43ff94a7f1ad1/30001024507.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210918_200334.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/mejodeno.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109162009367487.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/86942690221.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/rofuwojerunovefurulikes.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/afac25262d15775fde779e2ef61ad53e/xotomagiwikulomeredex.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea54d9a94---92723107990.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/45323788504.pdfIn PDF document text
    • http://vaynhe.com/upload/files/77982303783.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/42403291155.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/60m9hd44hithteo6d8tfl3sfe5/90789314491.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/95756762757.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/46649620604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+itunes+to+androidPDF 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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 10416 bytes
SHA-256: fae84698fb4d2809adbe44841e22818fb34706e37fb3a59773c4039a9b3a0377
font_02_sfnt_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 14372 bytes
SHA-256: f48b04651d96b574936d921b184c40f050228398c1e99b4dcb8e846740801f65

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