Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2d093334226d40…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 17:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea78927c2652228b2aa8b902a6b7dfb2 SHA-1: d67da0afec99a104a410cbb8f5a7ace49cf15196 SHA-256: ec2d093334226d40e648dc8a61abb4a51cd918531cb260588bdfd2d1b463478b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update, which is a common tactic for credential theft or malware delivery. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, further supports a malicious intent. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=hd+streamz+install+app PDF link annotation
    • http://marketingnews.fr/images/file/41625857862.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/4795712892.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613f8ffe050f5.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/52374067634.pdfIn PDF document text
    • http://leton.pl/userfiles/file/lexewol.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f33c23b5---fenabizebesonefosis.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/muvepozekasofapakuli.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/85293243429.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/jujakataxadijixijo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/jusepuzegoragazejalari.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/13135674622.pdfIn PDF document text
    • http://canadianrockies.info/files/file/nuxewopuzororolabadesa.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/90445072003.pdfIn PDF document text
    • https://breedlife.com/upload/files/49445582305.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/92183548152.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/dukuluxezezopekive.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/78906617593.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/ruxosaginutasobexu.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/gosuvevexiki.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/88414544915.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c89c0094e---40223720991.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410bb27f82d---91291814189.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/ninavisuzodovobone.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b133488b7---pazolugipisixa.pdfIn PDF document text
    • 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_off0000b6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BE 15976 bytes
SHA-256: 38c5de4eb132c6dfb9c5e5a12a1bd3a51969e05a9dd987172aa565c995ce7b5d
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 10484 bytes
SHA-256: fab614a130a655cd45db2d083368f6a10f4a3b090d44441cf37a6600f75afe3c
font_02_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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